Chapter 4 - Periodicity

Question 1

What is periodicity?

Answer 1

The regular recurrence of events or properties.

Question 2

What is the periodic law?

Answer 2

The properties of the elements vary periodically with their atomic numbers.

Question 3

What is the first ionisation energy?

Answer 3

The energy required to remove an electron from a neutral gaseous atom of the element.

Question 4

What is electronegativity?

Answer 4

The measure of the ability of an atom of that element to attract bonding electrons towards itself in compounds.

Question 5

What is screening effect?

Answer 5

The decrease in electrostatic force between a nucleus and an outermost electron brought about by completely filled electron shells between the nucleus and the outermost electron.

Question 6

What is the periodic table trend of atomic radius?

Answer 6

Increasing down a period and decreasing left to right across a group.

Question 7

What is the periodic table trend of ionisation energy?

Answer 7

Decreasing down a period and increasing left to right across a group.

Question 8

What is the periodic table trend of an elements reactivity with water?

Answer 8

Increasing down a period and decreasing left to right across a group

Question 9

What is the periodic table trend of electronegativity?

Answer 9

Decreases down a period and increasing left to right across a group.

Question 10

What is the periodic table trend of metallic character?

Answer 10

Increases down a period and decreases left to right across a group.