Question

Metallic Character

The ability of an atom to donate electrons and form positive ion (cation) is known as electron

positivity or metallic character. Down the group, metallic character increases due to increase in

atomic size and across the period, from left to right electro positivity decreases due to

decrease in atomic size.

Non- Metallic Character

The ability of an atom to accept electrons to form a negative ion (anion) is called non- metallic

character or electro-negativity. The elements having high electro-negativity have a higher

tendency to gain electrons and form union. Down the group, electro-negativity decreases due to

increase in atomic size and across the period, from left to right electro-negativity increases due

to decrease in atomic size.

(i) Which of the following have highest electro-negativity

a. F

b. Cl

c. Br

d. I

(ii) Which of the following set of elements is written in the order of their increasing

metallic character?

a. Na< Li< K

b. C< O< N

c. Mg< Al< Si

d. Be< Mg< Ca

(iii) Arrange the following elements in the order of their increasing non-metallic character-

Li,O,

C, Be, F

a. F<O<C<Be<Li

b. Li<Be<C<O<F

c. F<O<C<Be<Li

d. F<O<Be<C<Li

(iv) By considering their position in the periodic table which one of the following

elements would you expect to have maximum metallic characteristic?

Ca, Mg, Al, Si

(v) Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15

of the periodic table. Which of these will be more electro negative​

Answer 1

Explanation:

a . florine

ii.?

iii.b

iv.By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristics? Answer: Be (Beryllium) have the maximum metallic characteristics. Because metallic character decreases by moving from left to right in a Periodic Table.

v.Answer. N (2,5) ; P (2, 8, 5) ; Nitrogen will be more electronegative because its atom has small size due to which the attraction of its nucleus for the incoming electron is more.

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