N-type silicon is silicon that has been chemically combined (doped) with phosphorus gas to make it conductive. A silicon atom has four electrons in its outer shell and bonds tightly with four ...

If the imbalance is too great, radioactive decay will occur. Up to two electrons may exist in the atom's first shell. Up to eight electrons may exist in the atom's second shell. An electron may ...

Atoms of group 1 elements have one electron in their outer shell, and atoms of group 2 elements have two electrons in their outer shell. Elements in groups 6, 7 and 0 are non-metals. Atoms of ...

Atomic structure - AQA Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. The numbers of subatomic particles in an atom can be calculated from its ...