Periodic Properties

Atomic Radius

100

The general trend of atomic radius across a period is by..

decreasing.

200

The trend of atomic radius down a group is by..

increasing.

300

These elements have the largest atomic radius in the periodic table:

Alkali metals

400

The reason atomic radius decreases across a period is when it..

increases nuclear charge pulling electrons closer.

500

Which noble gas has the smallest atomic radius?

Helium

Ionization Energy

100

What is ionization energy?

Is the amount of energy required to remove an electron from an isolated atom or molecule.

200

The trend of ionization energy across a period is by..

increasing.

300

The trend of ionization energy down a group is by..

decreasing. 

400

This element has the highest first ionization energy:

Helium

500

Why does ionization energy decreases down a group?

Because it increases distance from the nucleus and shielding effect.

Electronegativity

100

This is the most electronegative element:

Fluorine

200

Electronegativity tends to increase in this direction across a period..

Left to right.

300

Electronegativity tends to change in this way down a group..

decrease

400

This group has no electronegativity values:

Noble gases

500

What is the reason electronegativity increases across a period?

Because it increases nuclear charge attracting bonding electrons