there are no electrons around the nucleus
the number of protons equals the number of electrons
there are equal number of protons and neutrons in the nucleus
the outer electron shell is completely filled
the atoms contain only protons
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If we look at the electron configurations, we see that helium (atomic number 2) has a full shell of two s electrons. Since there are no electrons shielding this shell from the nucleus, these two electrons will be very difficult to remove, making helium unreactive.
Answer:Helium is one of noble gases in group 8 of the Periodic Table. ... The proton number of helium is two, so a helium atom has two electrons, which exist in the 1s shell. It doesn't to gain or lose electrons to fill thus shell and is unreactive.
Helium has a complete shell of electrons, and in this form the atom does not readily accept any extra electrons nor join with anything to make covalent compounds.
