Question

Why do elements in the same group have similar physical and chemical properties?
What does atomie radius and lonie radius really mean to you?
How do atomic radius vary in a period and in a group? How do you explain the
variation?


Plzzz gys help me ​

Answer 1

Explanation:

Elements in same group have same no. of valence electrons hence they give or take same number of electrons when reacting. And hence they have same properties.

Atomic radius means the distance between the centre of nucleus and the outermost electron in a neutrally charged atom.

Whereas, ionic radius as the name suggests is the distance between the centre of nucleus and the outermost electron in an ion which may be positively or negatively charged.

Atomic radius of elements usually decreases from left to right in a period due to increase in nuclear charge, as the nuclear charge attracts the electrons towards it so the size decreases.

Atomic radius increases when going down a group even though nuclear charge increases as number of shell increases while going down the group and hence the effect of nuclear charge is insignificant.

In case of same period the number of shells is same that's why we consider increase in nuclear charge as a factor to decrease the size of atom.

Hope it helps...

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Answer 2

Answer:

$hope \: its \: useful$