Question

qn 13. the mass number on the periodic table tells you
number of protons, electrons and neutrons
number of protons
number of protons and electrons
number of protons and neutrons
clear all

Explanation:

To solve this, we recall the definition of mass number. The mass number of an atom is the sum of the number of protons and neutrons in its nucleus. The atomic number gives the number of protons (and also electrons in a neutral atom). So the mass number tells us the number of protons and neutrons.

Answer:

D. number of protons and neutrons (assuming the last option is D, if the options are labeled as A, B, C, D with the last one being "number of protons and neutrons", then the answer is the option with "number of protons and neutrons")