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periodic table challenge

Horizontales
The essential element of our world and lightest element on the periodic table.
Takes up 20% of every living organism; plants "exhale" a form of this element.
When you got to the dentist, your teeth are cleaned by a form of this element.
The basic unit of a chemical element.
This element is present in all cells in living organisms.
An element that is not a metal.
A subatomic particle with a neutral charge.
The outside part of an atom around the nucleus, group of atomic orbitals.
A bright yellow nonmetal element.
A subatomic particle with a positive charge.
Showing a response to a stimulus.
This element's largest use is manufactured steel.
The weight of an atom.
Verticales
You fill balloons with this.
The seventh most abundant element in the universe.
The number of protons in the nucleus of an atom.
Pirates hunt to find this is treasure boxes.
A table of chemical elements arranged by their properties and characteristics.
There is a coin named and made out of this element.
Without breathing this you will die.
Pennies and the statue of Liberty are made out of this element.
A very expensive element used to make jewelry.
A subatomic particle with a negative charge.
An element that has an atomic number of 14.
This element creates bright colored flashing signs.