Nuclear Charges

Question 1

What is a covalent radius?

Answer 1

The distance between an atoms nucules and its outer electrons

Question 2

What is ionisation energy?

Answer 2

The energy required to remove one mole of electrons from one mole of atoms from a gaseous state

Question 3

What is electronegativity?

Answer 3

The attraction an element has for bonding electrons

Question 4

What happens to a covalnet radius going across a period

Answer 4

Atomic size decreases, because there is an increase in nuclear charge

Question 5

What happens to covalent raius going down a group

Answer 5

Covalent radius increases down a group because an extra shell of electrons is added- electrons closer to the nuclues screen the outer electrons from the force of the nucules

Question 6

What happens to ionisation energy as you go across a period

Answer 6

First ionisation energy Increases across a period, because there is an increase in nuclear charge

Question 7

What happens to ionisation energy as you go down a group

Answer 7

Ionisation energy decreases down a group, because…screening effect…takes less energy to remove

Question 8

What happens to electronegativity across a period

Answer 8

Electronegativity increases across a period because more protons and electrons are added increasing nuclear charge

Question 9

What happens to electronegativity going down a group

Answer 9

Electronegativity decreases, screening effect

Question 10

Noble gases don’t have a covalent radius because they can’t form covalent bonds