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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