Atomic Structure

Question 1

Atomic Number

Answer 1

No. p (in nucleus of) an atom

Question 2

Mass Number

Answer 2

Total no. p + n (in nucleus) of atom

Question 3

RAM

Answer 3

av. (weighted mean) mass of an atom of an el. rel to 1/12th mass of an atom of C-12

Question 4

RIM

Answer 4

mass of an atom of an isotope of an el rel to 1/12th mass of an atom of C-12

Question 5

RMM

Answer 5

Mass (weighted mean) of one molecule relative to 1/12th mass of an atom of C-12

Question 6

RFM

Answer 6

av (weighted mean) mass of a formula unit relative to 1/12th mass of an atom of C-12

Question 7

Orbtial

Answer 7

Region within an atom that can hold up to 2e with opposite spins

Question 8

S subshell

Answer 8

One s orbital
Holds up to 2e

Question 9

P subshell

Answer 9

3p orbitals
Holds up to 6e

Question 10

D subshell

Answer 10

5 orbitals
Holds up to 10e

Question 11

What order do the subshells fill in?

Answer 11

1s,2s,2p,3s,3p,4s,3d,4p

Question 12

What order are the subshells written in?

Answer 12

1s,2s,2p,3s,3p,3d,4s,4p

Question 13

What is the e config of CU:

Answer 13

1s2,2s2,2p6,3s2,3p6,3d10,4s1

Question 14

What is the e config of CR:

Answer 14

1s2,2s2,2p6,3s2,3p6,3d5,4s1

Question 15

What is first ionisation of en?

Answer 15

En req to convert one mole of gaseous atoms into gaseous ions with a single positive charge

Question 16

What is the second ionisation en?

Answer 16

En req to convert one mole of gaseous ions with a single positive charge into ions with a double positive charge

Question 17

What is the third ionisation en?

Answer 17

En req to conv one mole of gaseous ions with a double positive charge into ions with triple pos charge

Question 18

What happens to first I.E across a period and down a group?

Answer 18

Across a period- 1st I.E en gen increases
Down a group- first I.E decreases

Question 19

Why does I.E increase across a period?

Answer 19

Increase in nuclear charge
Decrease in atomic radius

Question 20

Why does I.E decrease down a group?

Answer 20

Increase in atomic radius
Increase in shielding

Question 21

Why does N2 have a higher I.E than O2?

Answer 21

N2: 1s2,2s2,2p3- has half filled 2p subshell
O2 atom: 1s2,2s2,2p4- has more than half filled 2p subshell
Half filled 2p subshell is more stable