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introduction to elements

define elements

elements are one kind of atom

define compound

elements chemically bonded together to form an atom

protons

mass of 1 and 1 positive charge

neutrons

mass 1 and no charge

electron

mass taken as 0 and 1 negative charge

how are particles arranged in an atom

protons and neurons form thr nucleon, electrons circle the nucleon

atomic number

the amount of protons in an atom form the atomic number

how are electrons arranged in shells

the first shell has the lowest energy level -the further the shell the higher the energy level -the first shell can only hold 2 electrons -the second and third shells can hold 8 electrons

patterns in the periodic table

-period number tells you how many electron shells are occupied -the group number tells you the amount of outer electrons

isotopes

-atoms of the same element with the same number of protons but different number of neutrons

shorthand writing isotopes

the nucleon number goes over the electron number

carbon-12 atoms significance

carbon-12 is the standard for atomic mass units alll masses are relative to the carbon 12

how to calculate relative atomic mass

(atomic mass of the first isotopes* % abundance) + (atomic mass of the second isotope* % abundance)

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