Question

a neutral atom has 2electrons in its K shell 8electrons in its L shell and 2electrons in its M shell.Find the atomic number of the element.Write the symbol of the ion that will be obtained if the electrons in the M shell are removed from the atom​

Answer 1

Answer:

The energy levels are present as K=1,L=2,M=3,N=4.

So, in K shell, 2 electrons 1s

2

are present

In L shell, 8 electrons 2s

2

2p

6

are present

In M shell, 13 electrons 3s

2

3p

6

3d

5

are present

In N shell, 1 electron 4s

1

is present.

The total number of electrons is 24. Therefore, the atomic number is 24 and the element is Cr.

Electronic configuration of chromium is: 1s

2

2s

2

2p

6

3s

2

3p

6

4s

1

3d

5