4. Atoms and Elements

Atomic Mass (Simplified)

객관식
Which element has an average atomic mass of approximately $131.3$ amu?
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객관식
Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.16%. What is the amu of the other isotope?
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8
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객관식
Which element has the lowest atomic mass on the periodic table?
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객관식
Which element has an average atomic mass of 106.42 amu?
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객관식
Which element has an average atomic mass of approximately $106.42$ amu?
81
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객관식
Which element has the lowest atomic mass?
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객관식
Which element has the higher average atomic mass, cadmium (Cd) or zinc (Zn)?
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객관식
Only three isotopes of magnesium exist on earth. ²⁴Mg is the most common form at 78.70% natural abundance with a mass of 23.98504 amu, ²⁵Mg has a 10.13% natural abundance, while ²⁶Mg has a natural abundance of 11.17% and a mass of 25.98259 amu. What is the mass of the ²⁵Mg isotope?
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8
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객관식
Based on atomic mass, is mercury a heavier element than tin?
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교과서 질문
Indium consists of two isotopes, ¹¹³₄₉In and ¹¹⁵₄₉In. If the atomic mass for indium on the periodic table is 114.8, are there more atoms of ¹¹³₄₉In or ¹¹⁵₄₉In in a sample of indium?
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객관식
Which of the following choices has the greatest atomic mass?
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20
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교과서 질문
Argon has three naturally occurring isotopes, with mass numbers 36, 38, and 40.d. Why is the atomic mass of argon listed on the periodic table not a whole number?
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객관식
In the simplified atomic mass scale, what is the mass of one atom of carbon-12?
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