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2. Atoms and the Periodic Table

Atomic Mass (Simplified)

2. Atoms and the Periodic Table

Atomic Mass (Simplified)

Multiple Choice
Which of the following choices has the greatest atomic mass?
Multiple Choice
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?
Multiple Choice
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?
Open Question
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?
Open Question
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?