Mass Spectroscopy of the Elements

Practice Questions

AP Chemistry › Mass Spectroscopy of the Elements

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1

Which of the following isotopes has the greatest number of neutrons?

2

Which of the following statements is true?

3

Which of the following describes an isotope to ?

4

Anionic atoms are __________ than their respective neutral atoms because they have __________ electron(s) than their neutral atoms.

5

An element has two main isotopes. The first isotope has a molar mass of 125 grams, and the second isotope has a molar mass of 128 grams. A naturally occurring sample of the element has a molar mass of 126.8 grams.

What is the lighter isotope's percentage in the natural sample?

6

Chemical has only two isotopes: and . The atomic weight of chemical X, listed on the periodic table, is . What is the relative abundance of each isotope?

7

What is the sum of the number of neutrons of the following atoms: (a) N15
(b) Ag109 (c) Si30

8

A certain element X is comprised of isotopes A, B, and C. Isotope A has a mass of 50 amu and is 70% of naturally occurring X. Isotope B is 35 amu and is 25% of X. Isotope C has a mass of 70 amu and is 5% of X. What is the atomic weight of element X?

9

How many of each subatomic particle exist in ?

10

Which of the following contains the most neutrons?

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