Question

element that has equal number of electron in the ultimate and penultimate shell is

Answer 1

Explanation:

Hence, Ca2+ has 8 electrons each in outermost and penultimate shell.

Answer 2

Question - Which of the following element has equal number of electron in the ultimate and penultimate shell

Mg2+, O2-, F-, Ca2+

Answer - Ca2+ is the element with equal number of electron in the ultimate and penultimate shell

Magnesium has electronic configuration 2,8,2. Mg2+ has electronic configuration 2,8.

Oxygen has electronic configuration 2,6. O2- will have electronic configuration 2,8.

Fluorine has electronic configuration 2,7. Electronic configuration of F- will be 2,8.

Electronic configuration of Calcium is - 2,8,8,2. Electronic configuration of Ca2+is - 2,8,8.

Hence, calcium is the element with equal number of electrons in its ultimate and penultimate shell.

Naturally occuring element with equal number of electrons in ultimate and penultimate shell is noble gas Argon with electronic configuration 2,8,8.