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4. Which pair of elements has the smaller element listed first? (a) Al, B (b) C, N (c) Li, Na (d)
CI, F (e) Si, P
Solution
The rule is:
As we move down a group, atomic radius increases. this is because an additional shell is added
each time
As we move from left to right, atomic radius decreases. this is because an additional proton is
added to some shell which increases attraction
a)
they are in same group
Al will be bigger than B
b)
they are in same period
C will be bigger than N
c)
they are in same group
Na will be bigger than Li
d)
they are in same group
Cl will be bigger than F
e)
they are in same period
Si will be bigger than P
Answer: c

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