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Q.

In lanthanum (Z = 57), the 57th electron enters in a:

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a

6 p orbital

b

5 d orbital

c

4f - orbital

d

6s - obital

answer is B.

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Detailed Solution

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La (lanthanum) having atomic number 57 is a member of d-block elements as the last valence electron enters d orbital. It has two outermost shells incomplete. La belongs to 5d series.

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In lanthanum (Z = 57), the 57th electron enters in a: