How many elements found in nature are on the periodic table?

On the periodic table, this shows how many energy shells or levels there are in the atoms.

On the periodic table, this shows how many electrons are in the outside energy shell.

All of the elements placed to the left of the staircase on the periodic table are called ________. (in blue)

All of the elements placed to the right of the staircase on the periodic table are called ________. (in yellow)

All of the elements located on the staircase on the periodic table are called ________. (in red)

The atomic number tells the number of __________ & ____________.

The atomic mass tells the number of ____________ & _______________.

Except for Hydrogen and Helium, all of the atoms want ______ electrons in their outer shell to be stable (happy).

The number of electrons that can fit on the inside energy shell or orbit is ____.

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