Question

10. Asseration & Atomic size increand down the
group, and decrease
and decrease across period (left to right)
Reason because nuclear charge of an atom
increase across the period and decrease down
the group. what is right?
​

Answer 1

Answer:

Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus, making it more positively charged

Answer 2

Answer:

both assertion and reason are right

Explanation:

As nuclear charge increases across period, electron shells will be strongly held by the nucleus and closely bound along with the nucleus . Therefore the size of the atom is small... but as nuclear charge decreases across the group, electron shells will not be strongly held by the nucleus resulting in larger atomic size...

Hope it helpss u frnd!!!