Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Chemistry

The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is

(Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71).

1
Y3+ < Lu3+ < Eu3+ < La3+
2
Lu3+ < Eu3+ < La3+ < Y3+
3
La3+ < Eu3+ < Lu3+ < Y3+
4
More than one of the above
5
None of the above
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