Q17 of 30 Page 196

Give the symbols for:

(i) a metal of group 2


(ii) a metal of group 13


(iii) two non-metals of group 16


(iv) most reactive non-metal group 17.

(i) Mg.

(ii) Al.


(iii) O and S.


(iv) Most reactive non-metal of group 17 is fluorine because its electronegativity is more. Its symbol is F.


More from this chapter

All 30 →
15


(a) Which is the most reactive metal?


(b) Which is the most reactive non-metal?


(c) Name the family of L, Q, R, T


(d) Name one element from each of groups 2, 13 and 15.

16

This question refers to the elements of the periodic table with atomic numbers 3 to 18.

(a) (i) Which of them are noble gases?


(ii) Which of them are halogens?


(iii) Which of them are akali metals?


(iv) Which are the elements with valency 4?


(b) An element with atomic no. 3 combines with another element with atomic number 17; what would be the formula of the compound?


(c) What is the electronic configuration of an element with atomic number 10?

 18

Why is K more reactive than Li?

 19

Why He, Ne and Ar called inert gas?