Take a look in ~ the picture below. Every of those colored balls is an electron. In an atom, the electron spin approximately the center, likewise called the nucleus. The electrons choose to be in different shells/orbitals. Covering number one have the right to only hold 2 electrons, shell two have the right to hold 8, and for the first eighteen elements shell three deserve to hold a maximum of eight electrons. As you learn around elements with much more than eighteen electron you will find that shell three have the right to hold much more than eight. As soon as one covering is full, the next electron that is included has to move to the following shell.So... Because that the aspect of HELIUM, you currently know the the atomic number tells you the variety of electrons. That method there space 2 electrons in a helium atom. Looking in ~ the picture, you have the right to see there space two electron in shell one. That way the first shell is full.


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HeliumHelium (He) is the an initial of the Noble Gases. That is really non-reactive. So lot so, that it doesn"t form compounds with anything. Just like neon (Ne) and also argon (Ar), helium just floats around all by itself.It is non-reactive since it"s covering is full. Helium only has one atomic shell, which filling up as soon as it has two electrons.
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