Chapter 7

Question 1

The elements in the periodic table are arranged in ________

Answer 1

Increasing atomic number

Question 2

Elements are in ____ which show a repeating trend in physical and chemical properties called _____

Answer 2

Periods, Periodicity

Question 3

Elements with similar chemical properties are arranged in_____

Answer 3

Groups

Question 4

Elements can be classified into blocks, called s, p, d and F depending on

Answer 4

The electrons in their highest energy subshell

Question 5

Define ionisation

Answer 5

The energy required to remove one of electron from each calcium atom in one mole of gaseous calcium atoms to form a mole of gaseous 1+ ions

Question 6

Explain why the general trend in first ionization energies across a period increases

Answer 6

1. Nuclear charge increases
2. Same number of inner shells so shielding stays the same
3. Atomic radius decreases
4. Nuclear attraction increases somewhere energy needed to remove an electron

Question 7

Why are there small decreases in ionisations across a period

Answer 7

1. The 2p of shell has higher energy than the 2s sub shell
2. It is easier to remove the outer 2p electron in boron than the 2s electron in beryllium