An element A has 1 electron in its first shell. It combines with element B having 7 electrons in its third shell. What type of bond is formed?

 Question:

An element A has 1 electron in its first shell. It combines with element B having 7 electrons in its third shell. What type of bond is formed?

Solution:

Covalent bond

Explanation:

A has 1 electron in its first shell and so it needs 1 electron to attain the electronic configuration of Helium (2). B has 7 electrons in its third shell and so it needs 1 electron to have 8 electrons in its last shell. Since both of them need electrons, they will share electrons and so covalent bond will be formed.