A) A decrease in nuclear charge causes an increase in ionisation energy
B) An increase in nuclear charge causes an increase in ionisation energy
C) A decrease in atomic size decreases the ionisation energy
D) An increase in the number of valence electrons decreases the ionisation energy
Correct Answer: B
Solution :
When the nuclear charge increases in these atoms in which number of shells are same, the ionisation potential increases because force of attraction towards nucleus increases. Hence, ionisation energy generally increases from left to right across a period.
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