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- The atomic radius of elements of which of these would be nearly same?
- #Classification of Elements and Periodic table
- #Chemistry
- #Joint Entrance Examination Main
- #Engineering
- #National Eligilibility Cum Entrance Test
The atomic radius of elements of which of these would be nearly same?
Na, K, Rb, Cs
F, Cl, Br, I
Li, Be, B, C
Fe, Co, Ni, Cu
Answers (1)
As we have learnt,
Physical Properties of Elements -
Atomic Volume
In moving from left to right in a period the atomic volume first decreases and then increases because of the following reasons:
-
As we move in a period from left to right, first the increase in nuclear charge overcomes the increase in the number of electrons. Thus, the atomic volume decreases.
-
But on moving further in a period, newly added electrons enter into the p orbitals and because of the high shielding power of s and p orbitals, atomic volume increases.
|
Li |
Be |
B |
C |
N |
O |
F |
Ne |
|
13 |
5 |
5 |
5 |
14 |
11 |
15 |
17 |
|
Na |
Mg |
Al |
Si |
P |
S |
Cl |
Ar |
|
24 |
14 |
10 |
12 |
17 |
16 |
19 |
24 |
In moving from top to bottom in a group, the atomic volume increases due to the increase of the number of shells.
-
Atomic radii of transition elements remain almost same in period. Therefore Fe, Co, Ni, Cu have nearly same atomic radii.
Hence, option number (4) is correct
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