Question

match the periodic table terms:
atomic number = number of
mass number = +
neutrons = mass number -
options: protons, neutrons, electrons, atomic number

Explanation:

Define atomic number

The Atomic Number of an element represents the number of protons in the nucleus of an atom. Therefore, the first blank is filled with "Protons".

Define mass number

The Mass Number is the total number of protons and neutrons in an atomic nucleus. Therefore, the two blanks in the second equation are filled with "Protons" and "Neutrons" (or "Neutrons" and "Protons").

Determine neutrons formula

By rearranging the mass number formula, we find the number of neutrons by subtracting the atomic number (or number of protons) from the mass number. Looking at the available options, "Atomic Number" fits perfectly in the final blank.

Answer:

Match the periodic table terms:

Atomic number = number of <blank>Protons</blank>.

Mass number = <blank>Protons</blank> + <blank>Neutrons</blank>.

Neutrons = mass number - <blank>Atomic Number</blank>.