Question

What measures the number of protons and neutrons in an atom?

-Atomic Number
-Atomic Mass
-Isotopes
-Olons

Answer 1

Isotopes are different forms of the same atom that vary in the number of neutrons. The atomic mass of an element is the mean of the mass number for its isotopes. The atomic number defines the identity of an element by the number of protons in the nucleus.

Step-by-step explanation:

Isotopes are different forms of the same atom that vary only in the number of neutrons they possess. The atomic mass of an element is the calculated mean of the mass number for its naturally occurring isotopes. The atomic number defines the identity of an element and describes the number of protons in the nucleus.

Answer 2

Answer: atomic mass

Step-by-step explanation:

Mass Number. The mass number (A) of an atom is the total number of protons and neutrons in its nucleus. The mass of the atom is a unit called the atomic mass unit (amu).