Question

Name an element which does not have the number of electrons as stated in { C }, yet is chemically inactive

{c] state the maximum number of electrons that can be present in the outermost shell of an atom

Answer 1

Bohr-bury scheme — The electrons in the atom are arranged around the nucleus in different shells.

• the electrons first occupy the shells which are closet to the nucleus as it has the lowest energy, the three rules are as follows.
• The maximum number of electrons present in the shell is given by the formula { 2n² }, where n is the orbit number or shell number.
• the maximum number of electrons in different shells is as follows: The first orbit or K shell will have 2 X 1² = 2, The second shell will have 2 X 2² = 8, and, The third shell will have 3 X 3² = 18, and so on.
• The maximum number of electrons that can be accommodated in the outermost orbit is 8.
• Electron is not accommodated in a given shell unless the inner shells are filled.

Thus, He is that element that does not have the number of electrons as stated in { C }, yet is chemically inactive.