
Ionisation potential increases across a period from left to right because the
atomic radius increases and nuclear charge increases
atomic radius decreases and nuclear charge decreases
atomic radius increases and nuclear charge decreases
atomic radius decreases and nuclear charge increases


Important Questions on Periodic Properties and Their Variations


Group number | ||||||||
---|---|---|---|---|---|---|---|---|
Period | ||||||||
Second | ||||||||
Third | ||||||||
Fourth |
Note: In this table, does not represent hydrogen. Some elements are given in their own symbol and position in the periodic table while others are shown with a letter.
With reference to the above table answer the following questions.
(i) Identify the most electronegative element.
(ii) Identify the most reactive element of group .
(iii) Identify the element from period with the least atomic sizes.
(iv) How many valence electrons are present in ?
(v) Which element from group would have the least ionisation energy?
(vi) Identify the noble gas of the fourth period.
