Trends across the Period

The elements shown are in the same Period, identify the element with the largest atoms.

The atoms of 4 elements in the SAME period are shown. Which atom would you predict would be in Group 8/0.

Ionisation Energy is the energy required to remove an electron from the valence shell. Given that atomic radius decreases across the period what would you predict to be the trend in ionisation energy across (left to right) the period?

Electropositivity is the ability of an atom to lose electrons to form positive ions. Given that atomic radius decreases across the period what would you predict to be the trend in electropositivity across (left to right) the period?

Metals are elements which react by losing electrons to form positive ions. Use the diagram of metal atoms in Period 3 and predict which metal would be more reactive.

Given that atomic radius decreases across the period, predict the REACTIVITY of METALS across the period.

Explain why Sodium is more reactive than Magnesium and Aluminium.

i. It has the largest atomic radius

ii. It has the highest ionisation energy

iii. Its atoms have only 1 valence electron to lose while the others have more to lose

Non-Metals are elements which react by gaining electrons to form negative ions. Use the diagram of non-metal atoms in Period 3 and predict which would be more reactive.

Given that atomic radius decreases across the period, predict the REACTIVITY of NON-METALS across the period.

Explain why Chlorine is more reactive than the other non-metals shown.

i. It has the smallest atomic radius

ii. It has the highest ionisation energy

iii. Its atoms have to gain 7 valence electrons.