Question

The electronic arrangements of an atom with two electrons in the first shell is called _______ if the first shell is the valence shell.

Answer 1

• The arrangement of electrons in various shells around the nucleus is called electronic arrangement.
• The outermost shell of an atom containing the valence electrons is called valence shell.
• An atom with a maximum of two electrons in its outermost shell is called a duplet and its electronic configuration is called duplet configuration.
• For example, Helium has two electrons in its outermost shell i.e., valence shell, so, it has a duplet configuration.

Hence, the electronic arrangement of an atom with two electrons in the first shell is called duplet configuration if the first shell is the valence shell.