Question

Use the periodic table and what you know about mass numbers to complete each statement.

U-238 has
protons and146 neutrons.
A particular isotope of plutonium has 94 protons,
neutrons, and a mass number of 241.
Thorium-
has 90 protons and 137 neutrons.

Answer 1

U-238 has 92 protons and 146 neutrons.

A particular isotope of plutonium has 94 protons, 147 neutrons, and a mass number of 241.

Thorium-227 has 90 protons and 137 neutrons.