Question

Part (i) to (v) refer to changes in the properties of elements on moving from left to right across a period of the periodic table. For each property, choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d).
(i) The non-metallic character of the elements:
(a) decreases
(b) increases
(c) remains the same
(d) depends on the period

(ii) The electronegativity:
(a) depends on the number of valence electrons
(b) remains the same
(c) decreases
(d) increases

(iii) The ionisation potential:
(a) goes up and down
(b) decreases
(c) increases
(d) remains the same

(iv) The atomic size:
(a) decreases
(b) increases
(c) remains the same
(d) sometimes increases and sometimes decreases

(v) The electron affinity of the elements in groups 1 to 7:
(a) goes up and then down
(b) decreases and then increases
(c) increases
(d) decreases

Answer 1

(i) (b) increases
The non-metallic character increases from left to right across a period.

(ii) (d) increases
The electronegativity of elements increases from left to right across a period.

(iii) (c) increases
The ionisation potential increases from left to right across a period.

(iv) (a) decreases
The atomic size decreases from left to right across a period.

(v) (c) increases
The electron affinity of the elements in groups 1 to 7 increases from left to right across a period.