(a)
Interpretation: The classification of the following elements as metals or nonmetals is to be done.
Mg, Ti, Au, Bi, Si, Ge, B, At, Rn, Eu, Am, and Br
Concept introduction: The periodic table is composed of different types of elements, such as metals, nonmetals and metalloids. The elements that readily lose their valence electrons and obtain a positive charge are described as metals. The chemical properties are the outcome of how metals remove their electrons rapidly to form positively charged cations. They have a distinctive metallic lustre, are good conductors of electrity as well as heat.
On the other side, nonmetals are the elements that accept electrons in their valence shell and obtain a negative charge. They are not good conductors of electrity as well as heat.
(b)
Interpretation: An explanation regarding the elements called metalloids which show intermediate properties between metals and nonmetals is to be stated. The elements in the periodic table which are expected to be metalloid are to be identified.
Concept introduction:
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Chemical Principles
- Scientists J. J. Thomson and William Thomson (Lord Kelvin) made numerous contributions to our understanding of the atom’s structure. Which subatomic particle did J. J. Thomson discover, and what did this lead him to postulate about the nature of the atom? William Thomson postulated what became known as the “plum pudding” model of the atom’s structure. What did this model suggest?arrow_forwardDo the proton and the neutron have exactly the same mass? How do the masses of the proton and the neutron compare to the mass of the electron? Which particles make the greatest contribution W the mass of an atom? Which particles make the greatest contribution to the chemical properties of an atom?arrow_forwardThe average atomic masses of some elements may vary, depending upon the sources of their ores. Naturally occurring boron consists of two isotopes with accurately known masses ( 10B, 10.0129 amu and 11B, 11.0931 amu). The actual atomic mass of boron can vary from 10.807 to 10.8 19, depending on whether the mineral source is from Turkey or the United States. Calculate the percent abundances leading to the two values of the average atomic masses of boron from these two countries.arrow_forward
- An element consists of 1.40% of an isotope with mass 203.973 u, 24.10% of an isotope with mass 205.9745 u, 22.10% of an isotope with mass 206.9759 u, and 52.40% of an isotope with mass 207.Y766 u. Calculate the average atomic mass, and identify the element.arrow_forwardHow would you expect the chemical properties of isotopes of the same element to compare to each other? Explain your answer.arrow_forwardA cylindrical piece of pure copper (d=8.92g/cm2) has diameter 1.15 cm and height 4.00 inches. How many atoms are in that cylinder? (Note: the volume of a right circular cylinder of radius r and height h is V=r2 h .)arrow_forward
- a. Classify the following elements as metals or nonmetals: Mg Si Rn Ti Ge Rn Au B Am Bi At Br b. The distinction between metals and nonmetals is really not a clear one. Some elements, called metalloids, are intermediate in their properties. Which of these elements would you reclassify as metalloids? What other elements in the periodic table would you expect to be metalloids?arrow_forwardThe natural abundances and isotopic masses of the element neon (Ne) are Calculate the atomic mass of naturally occurring neon.arrow_forwardWhich of the following are isotopes of element X, the atomic number for which is 9: 919X, 920X, 189X, and 921X?arrow_forward
- A gaseous binary compound has a vapor density that is 1.94 times that of oxygen at the same temperature and pressure. When 1.39 g of the gas is burned in an excess of oxygen, 1.21 g water is formed, removing all the hydrogen originally present. (a) Estimate the molecular mass of the gaseous compound. (b) How many hydrogen atoms are there in a molecule of the compound? (c) What is the maximum possible value of the atomic mass of the second element in the compound? (d) Are other values possible for the atomic mass of the second element? Use a table of atomic masses to identify the element that best fits the data. (e) What is the molecular formula of the compound?arrow_forwardThese questions concern the work of J. J. Thomson. a. From Thomsons work, which particles do you think he would feel are most important for the formation of compounds (chemical changes) and why? b. Of the remaining two subatomic particles, which do you place second in importance for forming compounds and why? c. Propose three models that explain Thomsons findings and evaluate them. To be complete you should include Thomsons findings.arrow_forwardList some characteristic properties that distinguish die metallic elements from the nonmetallic elements.arrow_forward
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