3.2 how many sub-atomic particles dies an atom have + 3.3 how are subatomic particles distributed in an atom

Question 1

proton number (Z)

Answer 1

number of protons in its nucleus
(also known as atomic number as it tells us what element the atom comes from)

Question 2

nucleon number (A)

Answer 2

total number of protons and electrons in the nucleus
(also called mass number because an atoms mass comes mainly from the number of protons and neutrons in its nucleus)

Question 3

finding nucleon number (A) =

Answer 3

proton number (Z) + number of neutrons

Question 4

ion

Answer 4

the particle formed when an atom or group of atoms gains or looses electron(s), but the number of protons and neutrons remains the same

Question 5

isotopes

Answer 5

atoms of the same element that jane the same proton (atomic) number but different nucleon (mass) number
[they have different numbers of neutrons]

Question 6

electron shells and energy levels

Answer 6

innermost shell (closest to nucleus) have lowest energy
outermost shell (furthest away from nucleus have highest energy