If elements with principal quantum number n > 4 were not allowed in nature, then what will be the number of possible elements?(a) 60(b) 20(c) 4(d) 64This question was addressed to me in class test.This interesting question is from Atomic Masses and Composition of Nucleus in chapter Nucleus of Physics – Class 12

If elements with principal quantum number n > 4 were not allowed in na

1.	If elements with principal quantum number n > 4 were not allowed in nature, then what will be the number of possible elements?(a) 60(b) 20(c) 4(d) 64This question was addressed to me in class test.This interesting question is from Atomic Masses and Composition of Nucleus in chapter Nucleus of Physics – Class 12
Answer» Correct option is (a) 60 To EXPLAIN: MAXIMUM number of electrons in an ORBIT = 2n^2. As n > 4 is not allowed, the number of possible elements = 2(1)^2 + 2(2)^2 + 2(3)^2 Number of possible elements = 2(4)^2 Number of possible elements = 60.

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