Question

Name the element which has :

(iv) a total of four shells with two electrons in its valence shell?

Answer 1

• The electronic configuration of the element that has a total of four shells with two electrons in its valence shell can be written as 2, 8, 8, 2.
• Thus total number of electrons in the element is 20.
• Since, number of electrons is equal to the atomic number of a neutral atom, thus atomic number of the element is 20 and thus, the element must be Calcium (Ca).