Indicate the number of unpaired electrons in he. express your answer as an integer.

Answer : The number of unpaired electrons in helium is, 0

Explanation :

As we are given that the element is helium. The symbol of helium element is, (He).

The atomic number of helium element is, 2 that means it has 2 number of electrons.

Electronic configuration : It is defined as the representation of electrons around the nucleus of an atom.

Number of electrons in an atom are determined by the electronic configuration.

The electronic configuration of helium element is:

There is no unpaired electrons in helium element.

Hence, the number of unpaired electrons in helium is, 0

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.