3.1 Periodicity

Question 1

The first ionisation energy of an element is…

Answer 1

The energy required to remove one electron from each atom in one mole of the gaseous element to form one mole of gaseous 1+ ions

Question 2

Electronegativity

Answer 2

The ability of an atom to attract the electron pair in a covalent bond to itself

Question 3

Electronegativity _____ down a group and ______ across a period

Answer 3

Electronegativity decreases down a group and increases across a period

Question 4

Ionisation energy generally _____ down a group and _____ across a period

Answer 4

Ionisation energy generally decreases down a group and increases across a period

Question 5

Nuclear charge _____ down a group and ______ across a period

Answer 5

Nuclear charge decreases down a group and increases across a period

Question 6

Atomic radius _____ down a group and _____ across a period

Answer 6

Atomic radius increases down a group and decreases across a period

Question 7

Atomic shielding _____ down a group and ______ across a period

Answer 7

Atomic shielding increases down a group and stays the same across a period