Question

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Answer 1

Answer:

1.As we go from innermost shell outwards, this number denotes the number of subshell in the shell. Electrons in outer shells have higher average energy and travel farther from the nucleus than those in inner shells. Hence, M shell contains s,p and d subshells.

2.The 4d sub-energy level is at a lower energy than the 5p sub-energy level

For 4d, n=4 and l=2. Hence, (n+l)=4+2=6

For 5p, n=5 and l=1. Hence, (n+l)=5+1=6

As the value of (n+l) for 4d orbital is same as that of 5p orbital, 4d orbital is filled before 5p orbital as 4d orbital has lower value of n than 5 p orbital.

Note: If two orbitals have same value of (n+l), then the orbital with lower value of n will be filled .

3.Similarly, L shell is the second shell and it can hold up to 2(2)2 = 8 electrons.

4.Nitrogen is the seventh element with a total of 7 electrons. In writing the electron configuration for nitrogen the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for N goes in the 2s orbital. ... Therefore the N electron configuration will be 1s22s22p3.

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