Interpretation:
The criterion according to which the elements are arranged in a modern periodic table is to be stated.
Concept introduction:
The elements in a modern periodic table are arranged in increasing order of their
Answer to Problem 1CE
The elements are arranged according to increasing atomic number in a periodic table.
Explanation of Solution
According to Moseley, it was better to define elements on the basis of nuclear charge rather than
According to modern periodic law, elements are categorized on the basis of atomic number.
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Chapter 5 Solutions
Introductory Chemistry: Concepts and Critical Thinking (8th Edition)
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- In the first 36 elements, 6 elements have atoms whose average mass is within 0.2u of being twice the atomic number of the element. Write the symbols and names for these 6 elements.arrow_forwardThe elements of Group 7 (fluorine, chlorine, bromine, and iodine) consist of molecules containing atom(s).arrow_forwardThe element lanthanum has two stable isotopes, lanthanum 138 with an atomic mass of 137.9071u and, lanthanum 139 with an atomic mass of 138.9063u. From atomic mass of La, 138.9u what conclusion can you make about the relative percentage abundance of the isotopes?arrow_forward
- A fundamental idea of Daltons atomic theory is that atoms of an element can be neither created nor destroyed. We now know that this is not always true. Specifically, it is not true for uranium and lead atoms as they appear in nature. Are the numbers of these atoms increasing or decreasing? Explain.arrow_forwardIsotopic data for boron allow the calculation of its atomic mass to the number of significant figures justified by the measurement process. One analysis showed that 19.78 of boron atoms have an atomic mass of 10.0129u, and the remaining atoms have an atomic mass of 11.00931u. Find the average mass in as many significant figures as those data will allow.arrow_forwardThe CRC Handbook, a large reference book of chemical and physical data, lists two isotopes of rubidium (Z=37). The atomic mass of 72.15 of rubidium atoms is 84.9118u. Through a typographical oversight, the atomic mass of the second isotope is not printed. Calculate that atomic mass.arrow_forward
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