Question

define groups in the modern periodic table how do valency atomic size and metallic character vary in group that make number of an element is 14 examine if this element will have metallic properties or not give reason to justify your answer​

Answer 1

Answers

(a) Group : Verical columns in the modern periodic table are known as 'Groups'. There are

groups.

Valency remain same in a group

Atomic size increases from to P to bottom in a group.

Metallic character also increases from top to bottom in a group.

(b) Atomic number

Electric configuration

It is semi-metal or metalloid

Reason - It exibits some properties of metals and some properties of non-metals.

Answer 2

Answer:

horizontal columns in the modern periodic table are known as groups. there are 18 groups

Explanation:

valency

valency increases across the period till 13 and then again decreases

there is no change in valency down the group

atomic size

number of periods tell the number of of shells in the the atom

therefore down the group number of shells increase

so the atomic size increases too

and across the period number of shells remains same but due to increase in the nucleus the intramolecular force of attraction leads to decrease in the size of the atom

metallic character

metallic character or electropositivity is to lose electrons and gain a positive charge

since the atomic size increases down the group the distance between the nucleus and valence electrons increases that reduces the force of attraction between two which makes it easy to to lose an electron other than gaining an electron

but across the period the atomic size decreases which makes it difficult to lose electrons

so across the period metallic character decreases and down the group metallic character

14 is silicon which is is on the right side of periodic table therefore it is a non metal and does the metallic character decrease