Question

) How does the metallic character of elements change along a period of the
periodic table from the left to the right and why ?
b) Na, Mg, Al, Si, P, S, Cl and Ar are the elements of third period.
i) Which one of them is a noble gas ? Why ?
iil. Which one of them has the valency 4? What kind of bond does it
form ionic or covalent?

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Answer 1

Answer:

Metallic character decrease along the period from left to right.

Explanation:

because number of electrons are increasing but number of shells remain same hence tendency to loose electron decrease and thus metallic character decreases from left to right.

b) i) Ar, because its outermost shell is fully filled or it has stable electronic configuration.

i) Si (silicon) have valency 4 .And this will form covalent bond.

Answer 2

Explanation:

the tendency of metal to give an electron is called metallic character. in a period the no. of shells remains same but the no. of electrons in outermost shell increases. so the elements from right side of the table accept electron and left side elements give electron it means metallic character goes on decreasing in a period from left to right

b. yes they are in 3rd period

i. Ar is Noble gas becouse it is in 18th period and don't take part in any reaction as it's outermost shell is satisfied

ii. si has valency 4