chemistry revison-atoms

ATOMS

• ALL substances are made of atoms.
• they contain protons, neutrons and electrons .

atoms have a radius of about 0.1 nanometers .

NUCLEUS 

1) its in the middle of the atom

2) contains protons and neutrons 

3) positive charges due to the protons

4) almost the whole mass of the atom is concentrated in the nucleus

ELECTRONS

1) they move around the nucleus in electron shells 

2) negativley charged and are tiny/ they cover alot…