Trends in the Periodic Table

Question 1

What is the atomic radius(covalent radius)

Answer 1

It is defined as half the distance between the nuclei of two atoms of the same element that are joined together by a single covalent bond

Question 2

The values for atomic radius increase down the groups in the Periodic table because…….

Answer 2

1. A new shell is filled with electrons

2. The screening effect of inner electrons

Question 3

The values of atomic radius decrease down a group because

Answer 3

1. Increase in effective nuclear charge

2. No increase in screening effect

Question 4

What is first ionisation energy

Answer 4

It is the minimum energy required to completely remove the most loosely bound electron from a neutral gaseous atom in its ground state

Question 5

The values of ionisation energy decrease down the groups of the periodic table because….

Answer 5

1. Atomic radius increases

2. Screening effect of inner electrons increases

Question 6

The values of ionisation energy increase across the periods of the periodic table because

Answer 6

1. Atomic radius decreases

2. Increasing nuclear charge

Question 7

What is Electronegativity

Answer 7

It is a measure of the tendency of an atom to attract a bonding pair of electrons

Question 8

The electronegativity increases across a period because

Answer 8

1. Increasing effective nuclear charge

2. Decreasing atomic radius

Question 9

Electronegativity decreases down the groups because

Answer 9

1. Increasing Atomic radius

2. Screening effect of inner electrons