Isotopes and relative atomic mass

Question 1

what are isotopes?

Answer 1

a version of an element with different number of neutrons but same number of protons and electrons

Question 2

what is a relative atomic mass?

Answer 2

isotopes average mass of an element

Question 3

what is the eqaution for RAM (relative atomic mass)?

Answer 3

RAM= (isotope abundance (percentage) x isotope mass number) + (isotope abundance x isotope mass number) / total abundance

Question 4

isotopes should have the ____ atomic number but _________ mass number.

Answer 4

same atomic number
different mass number