1. The total number of protons and neutrons in the nucleus of an atom is its:
a. atomic number c. mass number
b. Avogadro constant d. number of neutrons

2. As the mass number of the isotopes of an element increases, the number of protons
a. decreases c. remains the same
b. increases d. doubles each time the mass number increases

3. As the atomic number increases, the number of electrons in an atom.
a. decreases c. remains the same
b. increases d. in undetermined

All atoms of the same element have the same
a. atomic mass c. mass number
b. number of neutrons d. atomic numder

Please refer to THIS ANNOUNCEMENT (https://www.askmehelpdesk.com/math-sciences/announcement-u-b-read-first-expectations-homework-help-board-b-u.html)

Atom - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Atom)
Periodic table - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Periodic_table)
Isotope - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Isotope)
Atomic number - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Atomic_number)

I'm fairly certain that readcing these links will take you much longer than reading your notes, which is the easiest way to do this.