Q.

14 elements of 6th period and 14 elements in 7th period in the periodic table are termed as respectively

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a

lanthanoids, actinoids

b

actinoids, lanthanoids

c

chalcogens, halogens

d

actinoids, halogens

answer is A.

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Detailed Solution

14 elements of sixth period are called lanthanoids and those of seventh period are termed as actinoids.
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14 elements of 6th period and 14 elements in 7th period in the periodic table are termed as respectively