Question

Plz explain the reason for the trend of ionization potential down the group.

Answer 1

ip decrease down the group as the atomic size increases

Answer 2

hey!!

here is ur answer!!
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FIRST WHAT IS IONISATION POTENTIAL??

It is the amount of energy required to remove an electron from the outer most shell of an isolated gaseous atom..

for example : M ( atom) ----> M+ (ion ) + e- ( electron)

here,

M - e- -----> M+ [ here some amount of energy required for the electrons is the I. P]


FACTORS WHICH AFFECT THE I. P

1. Atomic size : Increases
ionisation potential : decreases

as A.S increases the nuclear attraction on the outer electrons decreases.
Hence th outer electrons are loosely held.........i. p decreases.

2. Nuclear charge increases :
Ionisation potential decreases

the nuclear charge increases ,,,,,,the nuclear attraction on the outer electrons increases
hence the outer electrons are firmly held that is i. p increases

ACROSS THE PERIOD FROM RIGHT TO LEFT...


ionisation potential increases.. as nuclear charge increases and atomic radii decreases..

Metals lose e- and generally have low i. p compared to non metals..


DOWN THE GROUP .........

atomic radii(no of shell) increases i. p decreases and nuclear charge always increases...
inc. in atomic radii dominates over the group..

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Hope u understand !!!