Periodic Trends

As you move down the periodic table the atomic radius gets bigger. This is because...

• The atoms have more mass.

• The atoms have more protons.

• The atoms have more neutrons.

• The atoms have more energy levels.

Elements that have a high electronegativity

• Give up their electrons easily.

• Have a higher attraction between nucleus and electrons.

• Have more electron shells.

Ionisation energy is..

• The energy required to add an electron to an atom.

• The energy required to shield the outer electrons from the nucleus.

• How much energy it takes to remove an electron from a mole of atoms.

• A measure of the ability of an atom to attract a pair of electrons.

What has the greatest electronegativity out of Cl and Al?

• Cl

• Al

Down a group, atomic radii .....

• Increases

• Decreases

Electronegativity __________ from left to right within a period and __________ from top to bottom within a group.

• Decreases, increases

• Increases, increases

• Increases, decreases

• Stays the same, increases

What has the largest radius out of Cl and Cl^-?

• Cl

• Cl^-

Across a period, ionisation energies..

• Decrease

• Increase

What has the largest atomic radius?

• Li

• Be

• C

• F

What has the lowest electronegativity?

• Li

• H

• Cs

• K