Isotopes Practice Problems

The chemical symbol of the element is represented by X in the atoms given below:

¹³⁰₅₆X    ¹²⁸₅₄X    ¹³⁹₅₇X    ¹²⁶₅₂X    ¹³⁰₅₄X

Determine which atoms have an equal number of neutrons.

Consider the following pair of atoms below:

¹¹⁰₄₆Pd and ¹¹²₄₈Cd

Determine if the atoms have equal numbers of protons, electrons, or neutrons.

Potassium, a mineral that supports several body functions, has three naturally occurring isotopes. Provide the missing data for ⁴⁰₁₉K, one of the isotopes of potassium, in the following table:

¹⁹⁸₇₉Au, one of the radioisotopes of gold, is used in diagnosing liver disease. Provide the missing information for ¹⁹⁸₇₉Au in the following table:

The mass numbers of the two naturally occurring isotopes of rhenium are 185 and 187. Provide the isotopic symbol for each.

Provide the isotopic symbol for an atom with 50 neutrons and 45 electrons.

The chemical symbol of the element is represented by X in the hypothetical atoms listed below:

Identify which hypothetical atoms have equal mass numbers.

For the given nucleus representations, provide the atomic symbol and identify the isotopes.

The chemical symbol of the element is represented by X in the following hypothetical atoms:

Determine which hypothetical atoms have an equal number of protons.

Three isotopes of silicon, with mass numbers of 28, 29, and 30, exist naturally. How are these isotopes different?

Three isotopes of magnesium, with mass numbers of 24, 25, and 26, exist naturally. How are these isotopes similar?

 Certain isotopes of boron and chlorine are given below. Identify the number of protons and neutrons in each isotope. 

1. boron-11        

2. chlorine-35      

3. chlorine-37 

Identify the symbols for the isotopes below in the X-A notation (eg. B-10)

a. argon isotope with 21 neutrons
b. uranium isotope with 231 neutrons
c. nitrogen with 7 neutrons
d. bromine with 45 neutrons

Choose the pair of atoms that represent isotopes.