Trends in the Periodic Table

Question 1

What is a covalent radius

Answer 1

half the distance between 2 nuclei of 2 covalently bonded atoms

Question 2

What does the covalent radius do?

Answer 2

measure the size of an atom

Question 3

Does atomic size increase or decrease across a period?

Answer 3

decreases
-gains electrons which are more attracted to the nucleus

Question 4

Does atomic size increase or decrease down a group?

Answer 4

increase
-due to extra electron shells which are further away from the nucleus

Question 5

What is ionisation energy

Answer 5

the amount of energy required to remove 1 mole of electrons from one mole of atoms in the gaseous state

Question 6

Does ionization energy increase or decrease across a period?

Answer 6

increases
- more protons being added to the nucleus creating a greater nuclear charge

Question 7

Does ionization energy increase or decrease down a group?

Answer 7

decreases
- the outer electrons are further away and is less attracted to the nucleus
- less energy required to remove the electron

Question 8

What is electronegativity?

Answer 8

the measure of an atom’s attraction for the shared pair of electrons in a bond

Question 9

Does electronegativity increase or decrease across a period?

Answer 9

increases
- increased nuclear charge making the electrons more attracted to the nucleus

Question 10

Does electronegativity increase or decrease down a group?

Answer 10

decreases
-increased nuclear shielding, further away