Question

1. atomic number is equal to the number of ____ and ____

Explanation:

In Chemistry (a subfield of Natural Science), the atomic number of an element is defined as the number of protons in the nucleus of an atom. In a neutral atom, the number of electrons (negatively charged particles) is equal to the number of protons (positively charged particles) to maintain electrical neutrality. So the atomic number is equal to the number of protons (and also equal to the number of electrons in a neutral atom).

Answer:

protons; electrons (in a neutral atom, the atomic number equals the number of protons, and in a neutral atom, the number of electrons is also equal to the atomic number as the atom is electrically neutral)