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a
p→ ii; q→ iv; r→ iii; s→ i
b
p→ iii; q→ i; r→ ii; s→ iv
c
p→ i; q→ iii; r→ iv; s→ ii
d
p→ iv; q→ ii; r→ i; s→ iii
answer is B.
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Detailed Solution
Modern periodic law given by Moseley based on increasing atomic numberOld periodic table was given by Mendeleev based on increasing atomic massLantanoids belongs to 6th period Actinides belongs to 7th period