Consider the value of all four quantum number for last electron and spin multiplicity (2s + 1) for given two element 'X' and 'Y' in their ground state : [SEE DIAGRAM] The according to given informatio

Question

Consider the value of all four quantum number for last electron and spin multiplicity (2s + 1) for given two element 'X' and 'Y' in their ground state : [SEE DIAGRAM] The according to given information the correct statement is :

Prashant Kotian · Accepted Answer

Correct answer: A,B,C. Step 1: Identify which subshells are being filled during the fourth period: the 4s, 3d, and 4p subshells. Step 2: Note that the 4d subshell only begins filling in the fifth period (starting with Yttrium, Z=39). Step 3: Since the filling of 4d orbitals does not occur in any fourth-period elements in their ground state, the number of elements with 4d electrons is 0.

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