Question

Name or state the following with reference to the elements of the first three periods of the periodic table.
(a)noble gas with duplet arrangement of electrons.
(b)metalloid in period 3.
(c)valency of elements in group 14 and 15.
(d)noble gas having electronic con figuration : 2,8,8.
(e)group whose elements have zero valency.
(f)a covalent compound formed by an element in period 2 and a halogen.
(g)non-metallic element present in period 3 of groups 15 and 16.
(h)an electrovalent compound formed by an adult alkaline earth metal and a halogen.
(i)bridge elements of period 3 of group 1,2 and 3.
(j)alkali metal in period 3 that dissolves in water giving a strong alkali.
(k)typical elements of group 14 and 15.
(l)alkaline earth metal in period 3.

Answer 1

a) Helium
b) Silicon
c) 4 and 5
d) Argon
e) group 18
f) Carbon
l) Magnesium
k) 14 (Ge, Sn, Pb) and 15 (As, Sb, Bi)
j) Na
i) Li and Mg; Be and Al; B and Si.

Answer 2

a. Helium
b. Silicon
c. Group 14- 4 and group 15- 3
d. Argon
e. Noble Gases of group 18
f. CaF2
g. Phosphorus and sulphur
h. MgF2
i. Dont know
j. Sodium
k. Group 14- carbon group group 15-nitrogen group
l. Beryllium