The atomic number, or number, is the described as the number of in the nucleus of an chemical element. a) proton, protons b) photon, photons c) neutron, neutrons d) electron, electrons

Option (A) is the correct answer.

Explanation:

Atomic number is defined as the sum of total number of protons present in an atom. Each element has different atomic number.

And, atomic mass is the summation of total number of protons and electrons present in the nucleus of an atom.

For example, atomic number of fluorine is 9 which also means that a fluorine atom contains 9 protons.

Thus, we can conclude that the atomic number, or proton number, is the described as the number of protons in the nucleus of a chemical element.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6