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Question
Chemistry
Which of the following statements is not correct about modified Mendeleev's periodic table?
Q. Which of the following statements is not correct about modified Mendeleev's periodic table?
2349
213
Classification of Elements and Periodicity in Properties
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A
It consists of nine groups and seven periods.
40%
B
Group
V
III
like group
I
−
V
II
has been divided into two sub-groups
A
and
B
.
29%
C
The group of an element in the periodic table represents its valency.
17%
D
The elements of group
I
B
are called coinage metals.
14%
Solution:
Group
V
III
consists of three triads such as
F
e
,
C
o
,
N
i
;
R
u
,
R
h
,
P
d
and
O
s
,
I
r
,
Pt
arranged in
4
th
,
5
t
h
and
6
th
periods respectively.