atomic structure and bonding

Question 1

atomic number =

Answer 1

number of protons

Question 2

mass number =

Answer 2

number of protons + number of neutrons

Question 3

what is the number of protons shown by ?

Answer 3

the atomic number

Question 4

what is the mass number ?

Answer 4

the number of neutrons + the number of protons

Question 5

what determines the type of atom ?

Answer 5

number of protons

Question 6

what are isotopes ?

Answer 6

atoms with the same number of protons but a different number of neutrons

Question 7

what are electrons arranged in ?

Answer 7

electron shells

(energy levels)

Question 8

where are sub shells found ?

Answer 8

in the electron shells

Question 9

what is the order of sub-shells ?

Answer 9

S P D F

Question 10

how many electrons can be on the S sub-shell ?

Answer 10

2

Question 11

how many electrons can be on the P sub-shell ?

Answer 11

6

Question 12

how many electrons can be on the D sub-shell ?

Answer 12

10

Question 13

what is an electron orbital ?

Answer 13

the region of space in which the electron spends most of its time

Question 14

how many electrons can each orbital hold ?

Answer 14

2 electrons with opposite spins

Question 15

what is hunds rule ?

Answer 15

electrons prefer to occupy orbitals on their own and only pair up when no empty orbitals of the same energy are available

Question 16

what is the rule about 4s and 3d ?

Answer 16

4s fills before 3d BUT ALSO empties before 3d