Atomic structure

Question 1

Isotopes

Answer 1

atomns of the same element that have the same number of protons but a different number of neutrons

Question 2

proton number

Answer 2

number of protons in the nucleus

Question 3

mass number

Answer 3

the total number of protons and neutrons in the nucleas of an atomn

Question 4

relative atomic mass

Answer 4

average mass of naturally occuring atoms of an element on a scale where the carbon - 12 atom has a mass of exactly 12 units.

Eg: Mass of 100 atoms of chlorine
(35 x 75.0) + (37 x 25.0) = 3550
3550
100

Question 5

atomic theory

Answer 5

model of the atom in which electrons can only occupy certain shells