unit 1

Question 1

what is the definition of electronegativity

Answer 1

the measure of attraction an atom involved in a bond has for the electrons of the bond

Question 2

what is the definition of first ionisation energy

Answer 2

the energy required to remove 1 mole of electrons from 1 mole of gaseous atoms

Question 3

explain the trend in electronegativity going across a period

Answer 3

INCREASES
as the nuclear charge increases causing the atom to attract boned electrons more strongly

Question 4

explain the trend in electronegativity going down the group

Answer 4

DECREASES

Question 5

explain the trend of ionisation energy down a group

Answer 5

DECREASES
electron is being removed form an electron shell that is further away from the positively charged nucleus therefore attraction is less, less energy required

Question 6

explain the trend of ionisation energy across a period

Answer 6

INCRREASES
the number of protons increases therefore nuclear charge increase
harder to remove a mile of electrons

Question 7

what is pure covalent bonding

Answer 7

equal sharing of electrons, occurs in bonds where both atoms have the same electronegativity

Question 8

what is polar covalent bonding

Answer 8

occurs where there is unequal sharing of the bonding electrons because there is a difference in the electronegativity of each atom

Question 9

what is metallic bonding

Answer 9

the attraction between positive metal ions and free delocalised electrons

Question 10

what is ionic bonding

Answer 10

atoms with a large difference in electronegativity where there is no sharing of electrons.