Question

18. Name-:
a)An alkali metal in period 3 and halogen inperiod 2
b)The noble gas with 3 sheis.
c) The non-metals present in period 2 and metals in
perod 3
d)The element of period 3 with valency 4.
e) The element in period 3 which does not form oxide
09
f)The element of lower nuclear charge out of Be
and Mg
19. The electronic configuration of an element T is 2.8.
8. 1
(i)What is the group number of T?
(ii) What is the period number of T?
(iii)How many valence electrons are there in an atom
of T?
(iv) What is the valency of T?
(v) Is it a metal or a non-metal?
20. Match the atomic number 19. 15. 8.4 and 2 with each
of the following
(i)A metal of valency one.
(ii) A solid non-metal of period (iii)A rare gas
(iv) A gaseous element with valency 2.
(v) An element of group 2.​

Answer 1

Answer:

spydlyxykdyodyldyeydgdutuf

Explanation:

metal or a non-metal?

20. Match the atomic number 19. 15. 8.4 and 2 with each

of the following

(i)A metal