Periodic Table

Question 1

The periodic table

Answer 1

Displaying the elements in order of increasing atomic number and showing how periodicity of the physical and chemical properties of the elements relates to atomic structure

Question 2

Groups

Answer 2

The vertical columns in the periodic table

Question 3

Periods

Answer 3

The horizontal rows in the periodic table

Question 4

Atomic radius

Answer 4

Radius of an atom, the mean distance from the nucleus to the border of the outer orbital

Question 5

First Ionisation energy

Answer 5

Energy needed per mole to remove the first electron from an atom in the gasesous phase

Question 6

Electron affinity

Answer 6

The energy released when an electron is attached to an atom or molecule to form a negative ion

Question 7

Electronegativity

Answer 7

A measure of the tendency of an atom in a molecule to attract bonding electrons

Question 8

Trend in reactivity of the elements in group 1,2 and 17

Answer 8

Groups 1 and 2 - chemical reactivity increases from top to bottom

Group 17 - chemical reactivity decreases from top to bottom