Question

18. Name or state the following with reference to the elements of the first three periods of the periodic table.


a] The noble gas having duplet arrangement of electrons.

b] The noble gas having an electronic configuration 2, 8, 8.

c) A metalloid in period 2 and in period 3.

d) The number of electron shells in elements of period 1. period 2 and period 3.

e] The valency of elements in group 1 (IA).

f] The
group
whose elements have zero valency.

g] An alkaline earth metal in period 3.

h] The non-metallic element present in period 3 other than sulphur and chlorine.

i] A non-metal in period 2 having electronic configuration 2, 6.

J] An electrovalent compound formed between an alkali metal and a halogen.

k] A covalent compound formed between an element period 1 and a halogen.

L] An alkali metal in period 3 which dissolves in water giving a strong alkali.

m] A metal in period 3 having valency 3.

n] The bridge elements of period 3 of group 1 [IA], 2 [11A) and 13 [ITA].

o] The periods which contain the inner transition elements.

p] The formula of the hydroxide of the element having electronic configuration 2, 8, 2

q] The valency of the element in period 3 having atomic number 17,

r] A non-metal in period 2 which is tetravalent
92

Answer 1

Answer:

A) HELIUM

B) ARGON

C) BORON AND SILICON

D) IN PERIOD 1 THERE IS 2 ELECTRON SHELLS, WHEREAS PERIOD 2 AND PERIOD 3 HAVE 8 ELECTRONS

E) THE VALENCY OF AN ELEMENT IS DETERMINED BY THE NUMBER OF OUTER SHELL.

F) NOBLE GROUP

G) BERYILLIUM, MAGNESIUM, CALCIUM, STRONTIUM, ETC.

H)  PHOSPHORUS

I) FLOURINE ( MAYBE)

J) RUBIDIUM FLORIDE

K) HCL - FORMED WITH HYDROGEN AND CHLORINE

L) SODIUM

M) ALUMINIUM

N) -

O) PERIOD 6 AND PERIOD 7 CONTAINS TRANSITION ELEMENTS

P) Mg(OH)

Q) VALENCY = 1

HOPE IT HELPS