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Which of the following set of statement ...

Which of the following set of statement is correct
a= magnetic quantum number can have negative value
b= In ground state electron are always filled according to increasing order of energy of orbital
c= total number of nodes are (n-2)
d= electronic configuration of Cr is [Ar} `3d^5 4S^1`

A

a,b,d

B

a,b,c

C

b,c,d

D

a,c

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