EL3

Question 1

principal quantum number is the same as

Answer 1

shell number

Question 2

as quantum shells get further from nucleus

Answer 2

they get increasingly closer together

Question 3

number of electrons held in shells 1-4

Answer 3

1st shell - 2 electrons
2nd shell - 8 electrons
3rd shell - 18 electrons
4th shell - 32 electrons

Question 4

filled shell

Answer 4

a shell containing its max number of electrons

Question 5

sub shells held in shells 1-4

Answer 5

1st shell - s
2nd shell - s, p
3rd shell - s, p, d
4th shell - s, p, d, f

Question 6

electrons held in an orbital

Answer 6

2

Question 7

number of orbitals and electrons in sub shells s, p, d, and f

Answer 7

s - 1 orbital, 2 electrons
p - 3 orbitals, 6 electrons
d - 5 orbitals, 10 electrons
f - 7 orbitals, 14 electrons

Question 8

4s sub shell is filled before

Answer 8

3d sub shell because it has a lower energy level
however 4s is emptied before 3d
(4s is still physically further from nucleus)

Question 9

shape of orbitals

Answer 9

s - spherical
p - 8 shape along x-axis
d - 8 shape along y axis
f - 8 shape along z axis

Question 10

two electrons can only occupy the same orbital if

Answer 10

they have opposite/paired spins (shown by upwards arrow alongside downwards arrow)

Question 11

where there is an empty orbital with the same energy

Answer 11

the electron will occupy the empty orbital

less repulsion between electrons in separate orbitals, so arrangement of lower energy and more stability

Question 12

elec tronic configuration

Answer 12

arrangement of electrons in shells and orbitals

Question 13

electronic configuuration of chromium

Answer 13

having 6 unpaired electrons (5 in 3d, 1 in 4s) has a lower energy than if two paired in 4s and 4 unpaired 3d

Question 14

electronic configuration of copper

Answer 14

having 10 electrons in 3d and 1 electron in 4s has lower energy than 9 in 3d and 2 in 4s