Which of the following are physical properties of matter? An atom of the isotope ¹³³Cs contains how many protons (p), neutrons (n), and electrons (e)? (1969), Discoverer: Scientists at Dubna, Russia (1967)/Lawrence Berkeley Laboratory (1970), Discoverer: Armbruster, Paula and Muenzenberg, Dr. Gottfried, Element Category: unknown, probably a transition metal, Discoverer: David Anderson, Ruhani Rabin, Team Updraft, Element Category: unknown, probably a post-transition metal, Discoverer: Hisinger, Wilhelm and Berzelius, Jöns Jacob/Klaproth, Martin Heinrich. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Tellurium is chemically related to selenium and sulfur. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. The chemical symbol for Nickel is Ni. The chemical symbol for Calcium is Ca. At room temperature, the a axis is longer than the a axis by 1%. Which of the following states of matter is portrayed by the following description: assumes the shape of its container because it has a definite volume but no specific shape? Which of the following describes a chemical change involving water? Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. Question #6f4d0. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. Objects that have a density of less than 1gcm31gcm3 will float on water. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. Thus a neutral carbon-14 atom has 6 electrons. ... How would #Mg# change to gain a noble gas structure? Leading zeros and trailing zeros without a decimal point are not significant. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. Science Anatomy & Physiology Astronomy ... What element has a noble gas notation (Xe) 6s2? Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. Knowledge of the electron configuration of different atoms is useful in understanding the structure of the periodic table of elements. Discoverer: Ramsey, Sir William and Cleve, Per Teodor. When converting a number to scientific notation, the decimal place is moved once for each power of 10 in the original number to leave only one number before the decimal point. The chemical symbol for Tellurium is Te. (The mass of one mole of calcium is 40.08 g.) Answer: 0.01086 mol, 3.00x10^21 atomsofCa x 1molCa/6.22x10^23 atomsofCa = 0.00498 mol Ca, How many moles of iron atoms do you have if you have 7.60 × 10²³ atoms of iron. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Barium has the noble gas configuration [Xe]6s². Which of the following represents the correct conversion factor between grams and pounds? Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. How many electrons are in a neutral ⁴¹Ca atom? A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. The number 0.0509 has ___ significant figures. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. Noble gas is translated from the German noun Edelgas, first used in 1898 by Hugo Erdmann to indicate their extremely low level of reactivity. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used. Which one of these represents a CHEMICAL change? Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. What charge does the barium ion possess in the compound #BaCl_2#? Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. [Xe] 6s2 for barium). Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Question #6f4d0. What charge does the barium ion possess in the compound #BaCl_2#? Iron is a metal in the first transition series. If the original number is greater than 1, then the decimal place is moved to the left and the exponent in the ×10 indicates how many times the number needs to be multiplied by 10. Academia.edu is a platform for academics to share research papers. The relationship between degrees Celsius and degrees Kelvin is ∘C=K−273.15. What is the correct IUPAC name for CuSO₃? The mass number of an atom represents the total number of protons and neutrons in the atom. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese. The prefix micro- indicates 10^−6. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. To convert it into scientific notation, the decimal place is moved to the left to create a coefficient that is a number that is less than 10 but greater than 1. What is the correct IUPAC name for FeCl₃? Thulium is an easily workable metal with a bright silvery-gray luster. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. The number 0.000741 written in scientific notation would be, When converting a number to scientific notation, the decimal place is moved once for each power of 10 in the original number to leave only one number before the decimal point. Which of the following metric prefixes corresponds to 10⁻³? Length changes based on how much of a substance is present. V acetone= 19.33/ 0.784 g/mL = 24.6556 mL x 1cm^3/1mL =24.6556cm^3. For example, carbon has nine possible integer oxidation states from −4 to +4. Hafnium’s large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. Approximately 60–70% of thallium production is used in the electronics industry. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Under standard conditions, it is the lightest metal and the lightest solid element. The chemical symbol for Rubidium is Rb. Which of the following is an alkaline earth metal? The element symbol for arsenic is "As". There are 6.022×10236.022×1023 particles in one mole. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. 2,8, 7. The Cookies Statement is part of our Privacy Policy. The information contained in this website is for general information purposes only. Leading zeros and trailing zeros without a decimal point are not significant. A solution is a type of homogeneous mixture composed of two or more substances. This fact has key implications for the building up of the periodic table of elements. Determine the mass, in grams, of 0.670 moles of I (1 mol of I has a mass of 126.90 g). Which will have a higher density: 1.00 g of pure gold or 1.00 kg of pure gold? The chemical symbol for Neodymium is Nd. The name samarium is after the mineral samarskite from which it was isolated. The chemical symbol for Caesium is Cs. 2) You may not distribute or commercially exploit the content, especially on another website. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. What is the correct IUPAC name for AlBr₃? Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. How many atoms of vanadium are in 1.28 grams of vanadium? Which of the following metric prefixes corresponds to 10³? The chemical symbol for Phosphorus is P. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. Write an equation for the reaction. The prefix mega- indicates 10^6. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. How many electrons are in a neutral carbon-14 atom? Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. The chemical symbol for Polonium is Po. (iii) A and I are alkali metals. Platinum is one of the least reactive metals. An element that is not combined with any other different elements has an oxidation state of 0. The atomic mass is an average that represents the abundance of each isotope. the properties of a noble gas the lowest atomic mass because it is a gas. Which subatomic particle is found in the nucleus and has a positive charge? It is one of the least reactive chemical elements and is solid under standard conditions. Which one of the following is an example of a heterogeneous mixture? The chemical symbol for Silicon is Si. Be sure to account for non-zero digits, zeros found between two significant digits, and zeros following a significant digit in a decimal. ... (and two more protons) than Xe. The alkaline earth metals are found in Group 2 and include Be, Mg, Ca, Sr, Ba, and Ra. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. The chemical symbol for Mercury is Hg. What is the correct IUPAC name for SrCl₂? Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. In this case, that is 5.54780000040×10^11, but this number has 12 significant figures.