Question

. Four elements P, Q, R and S have atomic number 12, 13, 14 and 15
respectively. Answer the following :
(a) What is the valency of Q ?
(b) Classify these elements as metals and non-metals.
(c) Which of these elements will form the most basic oxide ?

Answer 1

elements :
P --12
Q--13
R---14
S--15
a)What is the valency of Q ? 
Element q atomic number is 13
number of protons:13
electronic configuration 1s2 2s2 2p6 3s23p1
valency --3

b]Metal---p,Q,
Non metals: S

c]Which of these elements will form the most basic oxide 
Metal reacts with oxygen to form basic oxides.
So elements : P,Q

Answer 2

Q--13
R---14
S--15
a)What is the valency of Q ?
Element q atomic number is 13
number of protons:13
electronic configuration 1s2 2s2 2p6 3s23p1
valency --3

b]Metal---p,Q,
Non metals: S

c]Which of these elements will form the most basic oxide
Metal reacts with oxygen to form basic oxides.
So elements : P,Q