Question

the orbital in which electrons fitted first A)3d B)4s C)4p D)4d​

Answer 1

this is correct answer

and answer is option B

Answer 2

Answer:

4 s

Explanation:                                                                                                                                     According to 'n+l' rule :                                                                                                                          The orbital having the lowest 'n+l' rule will be filled first                                                     So for 4 s it is  4 + 0 = 4 while for others it is 5 , 5 and 6  hence 4 s will be filled first