electron stucture

Question 1

what is the electron configuration

Answer 1

the arrangement of electrons in an atom

Question 2

what does the principal quantum number indicate

Answer 2

used to number the energy levels or quantum shells
- the lower the principal quantum number, the closer the shell is to the nucleus

Question 3

what is the principle quantum number

Answer 3

the shell number

Question 4

what is a shell

Answer 4

a group of orbitals with the same principal quantum number

Question 5

how many electrons can be in the first, second, third and fourth shell

Answer 5

1. 2
2. 8
3. 18
4. 32

Question 6

what is an orbital

Answer 6

a region around the nucleus that can hold up to 2 electrons with opposite spin

Question 7

how many electrons can an orbital hold

Answer 7

2

Question 8

what are the 4 types of orbital

Answer 8

S
P
D
F

Question 9

what is the shape of the S orbital

Answer 9

spherical

Question 10

what is the shape of the P orbital

Answer 10

dumbell

Question 11

how many orbital are found in the S subshell + electrons

Answer 11

1 orbital
2 electrons

Question 12

where are orbitals found

Answer 12

inside subshells

Question 13

how many orbitals are found in the P sub shell + electrons

Answer 13

3 orbitals
6 electrons

Question 14

how many orbitals are found in the D subshells + electrons

Answer 14

5 orbitals
10 electrons

Question 15

how many orbitals are found in the F subshells + electrons

Answer 15

7 orbitals
14 orbitals

Question 16

what letter is used to represent the shell number

Answer 16

n

Question 17

from which shell onwards is the S orbital present

Answer 17

n = 1

Question 18

from which shell onwards is the P orbital present

Answer 18

n = 2

Question 19

from which shell onwards is the D orbital present

Answer 19

n = 3

Question 20

from which shell onwards is the F orbital present

Answer 20

n = 4

Question 21

what is a subshell + example

Answer 21

a group of orbitals of the same type within a shell
e.g 2s2, 2p6
e.g. 3s2, 3s6, 3d10

Question 22

what are the rules by which electrons arranged in a shell

Answer 22

orbitals fill in order of increasing energy
each energy level must be fulled before the next one can fill
each orbital is filled singly before pairing
4s is filled before 3d

Question 23

why is the 4s orbital filled before the 3d orbital

Answer 23

4s orbital has a lower energy than 3d before it is filled

Question 24

what is the electron configuration of krypton - 36 electrons

Answer 24

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6