1.6 Structure Of An Atom
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Def proton
A tiny positive particle found inside the nucleus of an atom
Def neutron
A dense particle found in the nucleus of an atom. It is electrically neutral and carries no charge
Def electron
A tiny particle with a negative charge. Electrons orbit the nucleus of atoms or ions in shells
What overall charge does a nucleus have
Positive
Relative charge proton
+1
Relative charge electron
-1
Where is the mass of an atom concentrated
Nucleus
Proton relative mass
1
Neutron relative mass
1
How light is an electron?
So small that it can be ignored when working out the relative mass of atoms
What is the overall charge of an atom
0 because there is the same amount of protons and electrons
What is the number of protons (and electrons) in each atom called?
Atomic number
How are elements in periodic table arranged
By atomic number
Mass number def
Number of protons plus neutrons in an atom
Where is atomic number on the periodic table
Above the element
Where is the mass number of the periodic table
Below the element