Question

Q17. Read the following and answer any four questions from 17 (i) to 17 (v) 1x4
Atomic size refers to the radius of an atom. The atomic size may be visualized as the
distance between the centre of the nucleus and the outermost shell of an Isolated atom.
The atomic radius of the hydrogen atom is 37 pm. pm. Atomic size decreases in going from
left to right along a period.
U (3)
De (4)
B (5)
C(6)
N (7)
0 (8)
F (9)
Elements of 2
period atomic radius
(pm)
133
B9
BO
70
66
N (11)
Mg (12)
Al (13)
SI (14)
P (15)
S (16)
CH (17)
Elements of 3
period atomic radius
(pm)
154
136
125
117
110
104
99
Q17. (i) Identify the reason for the decrease of atomic size in the period-
(a) New shells are being added which increase the distance between outermost
electrons and nucleus.
(b) Increase in nuclear charge tends to pull electrons closer to the
nucleus.
(c) Electronegativity increases from left to right in period. (d) Valency is different for all elements in the group.​





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