1
Q
element
A
A pure substance that cannot be broken down into any simpler substance
2
Q
compound
A
Any substance that is formed by the chemical combination of two or more elements and acts like a single substance
3
Q
atom
A
The smallest unit of an element that retains the properties of that element.
4
Q
proton
A
A particle in the nucleus of an atom that carries one unit of positive electric charge
5
Q
neutron
A
A particle in the nucleus of an atom that has no met electric charge.
6
Q
electron
A
A particle in the space outside the nucleus of an atom that carries one unit of negative electric charge
7
Q
nucleus
A
A dense structure inside the cell
8
Q
molecule
A
A particle that contains more than one atom joined together
science 5th grade
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