Question

5. Examine elements of the third period :
Na, Mg, Al, Si, P, S, CI, Ar and answer the following:
(a) Choose (i) Metals and (ii) Non-metals out of these
elements.
(b) On which side of the Periodic Table can we locate:
(i) Metals and (ii) Non-metals?
(c) Name the metalloid out of the elements given above.
Where are they located in the Periodic Table?
(CBSE 2011)​

Answer 1

Answer:

Metals: Na, Mg, Al

    Non-metals: P, S, Cl

(b) Metals like Na, Mg are towards left hand side of the periodic table while non-metals like S and Cl are on the right hand side.

(c) Si is a metalloid.

In the modern periodic table, metalloids form a zig - zag line which separates metals from non-metals and they exhibit properties of both metals and non-metals.

Explanation: