Topic 3 - Periodicity

Question 1

Group 1 elements

Answer 1

Alkali metals

Question 2

Catalyst

Answer 2

A substance that increases the rate of reaction while being recoverable unchanged at the final stage of the reaction.

Question 3

heterogeneous

Answer 3

In different state than reactants

Question 4

homogeneous

Answer 4

In the same state as reactants

Question 5

Colored complex

Answer 5

A complex is a compound in which molecules or ions form dative bonds to a metal atom or ion. Colors are due to e- transitions between different d orbitals.

Question 6

Co-ordination number

Answer 6

Number of lone pairs bonded to the metal ion
e.g.
Cl- gives 4 coordinate bonds, H2O gives 6
NH3 gives 4 or 6

Question 7

Electronegativity

Answer 7

The ability an atom has to attract a shared pair of electrons.
Relative scale to Florine

Question 8

What determines a Group?

Answer 8

Elements with the same number of valence e-

Question 9

Halide ions

Answer 9

Ions of the halogens

Question 10

Ligand

Answer 10

A molecule / ion that can donate an electron pair

Question 11

Metalloid

Answer 11

An element that possesses properties of a metal and a non-metal

Metal oxides = basic
Non-metal oxides = acidic,
Metalloid oxides = amphoteric. e.g. aluminium oxide

Question 12

Transition element

Answer 12

An element with incomplete d sub-level in one or more of its oxidation states.

Often very efficient catalysts as they can exist in a variety of oxidation states