Atomic structure(recap)

Question 1

What is the relative mass of a electron?

Answer 1

1/1836

Question 2

Atomic Number?

Answer 2

Number of protons in the nucleus of an atom

Question 3

Mass Number?

Answer 3

Sum of the protons and neutrons in the nucleus

Question 4

Relative Atomic Mass (Ar)?

Answer 4

average mass per atom of an element x 12/ mass of one atom of carbon-12

Question 5

define isotopes?

Answer 5

Atoms with the same number of protons but different numbers of neutrons