Electronegativity

Question 1

Electronegativity

Answer 1

The ability of an atom to attract a pair of electrons in a covalent bond

Question 2

Explain trend shown in electronegativity across period 3

Answer 2

Nuclear charge ⬆️
Shielding stays the same
Atomic radius ⬇️
Nuclear attraction ⬆️
Electronegativity ⬆️

Question 3

What elements in period 3 are giant metallic

Answer 3

Na, Mg, Al

Question 4

What elements are giant covalent in period 3

Answer 4

Si

Question 5

What elements are simple molecular structures across period 3

Answer 5

P, S, Cl, Ar

Question 6

Explain melting & boiling point in first 3 elements across period 3

Answer 6

More delocalised electrons
More charge on cations
Stronger electrostatic attraction between them
Needs more energy to overcome them

Question 7

Why is the melting point of element 4 so high

Answer 7

It has lots of covalent bonds which require more energy to break

Question 8

What forces determine the melting point of molecular elements

Answer 8

Intermolecular forces = London forces

Question 9

Molecular formulae for P4, S8, Cl2, Ar
And explain the pattern

Answer 9

60e-
128e-
34e-
18e-

The more electrons you have, the stronger London forces so more dipoles will occur