Element Box page 7 Si Silicon 14 Atomic number Chemical Symbol

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Presentation transcript:

Element Box page 7 Si 28.086 Silicon 14 Atomic number Chemical Symbol Atomic mass Name

amu = atomic mass unit The mass of subatomic particles is so small that a special unit of measurement is needed just for them. 1 proton = 1 amu 1 neutron = 1 amu 1 electron = < 1amu Remember most of an atom’s mass is in the nucleus: p + n * see Gateway p15 : draw each example

The number of protons + the number of neutrons Atomic number The number of protons found in the nucleus Each atom of an element has a specific number of protons and electrons so no two elements are the same. Atomic Mass The number of protons + the number of neutrons Most of an element’s mass is in the nucleus.

Helpful Hints Mass - Atomic # # Neutrons Atomic # = Protons = all the same # Electrons =