The periodic table
- Created by: lucie1705
- Created on: 15-12-18 14:02
THE PERIODIC TABLE 1
- In an atom, the number of electrons equals the number of protons
- there is 0 overall charge
- All atoms of the same element have the same number of protons
- Atomic number= no. protons+ no.electrons
- mass number= no.protons+ n0. neutrons
- Atoms consist of a central nucleus containing protons and neutrons. It is surrounded by electrons in energy levels (shells)
- Electrons are not evenly spread, they exist in layers known as shells
- this arrangement is called the electron configuration 2,2,8 PEN: subatomic particles
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