Question

a particular atom has seven electrons and eight neutrons. this is an atom of - select - . it has - select - protons. the mass number of the atom is - select - .

Explanation:

Step1: Identify element by electron number

In a neutral atom, the number of electrons is equal to the number of protons. Since there are 7 electrons, the number of protons is 7. The atomic number (number of protons) determines the element. An element with atomic number 7 is nitrogen.

Step2: Calculate mass number

The mass number of an atom is the sum of the number of protons and neutrons. Given 7 protons and 8 neutrons, the mass number is \(7 + 8=15\).

Answer:

This is an atom of nitrogen. It has 7 protons. The mass number of the atom is 15.