1
Scientist that classified elements in a chart called periodic table.
2
The number of protons in an atom.
3
A negatively charged particle in an atom.
4
The smallest particle of a compound that has the compound´s properties.
5
The dense center of an atom.
6
A particle that has no charge in an atom.
7
Every element has this that is one or two letters long and represents its name.
8
The positive particle in an atom.
9
The smallest particle of an element.
10
An atom with a different number of protons than electrons.
