Question

An element y has the following electronic configuration 1s2 2s2 2p6 3s2 3p6 3d7 4s2 wat is the atomic number​

Answer 1

Answer:

Atomic number:27

Element :Cobalt (Co)

Explanation:

The superscript numbers in electronic config. show the number of electrons in that shell.

so for this:

2+2+6+2+6+7+2 = 27

Hence this atom has 27 electrons