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Tardigrade
Question
Chemistry
How many of the following pairs have approximately equal radii? ( Zr , HF ) ;( Nb , Ta ) ;( Cr , Mn ) ;( Mn , Fe ) ;( Nb 3+, Ta 3+) ;( Zr 4+, Hf 4+)
Q. How many of the following pairs have approximately equal radii?
(
Z
r
,
H
F
)
;
(
N
b
,
T
a
)
;
(
C
r
,
M
n
)
;
(
M
n
,
F
e
)
;
(
N
b
3
+
,
T
a
3
+
)
;
(
Z
r
4
+
,
H
f
4
+
)
176
164
The d-and f-Block Elements
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Answer:
6