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atomic number
amount of protons in an tom
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mass number
amount of protons and neutrons in an atom
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list most abundant to least abundant elements in the body
- Oxygen-65%
- carbon-18.5
- hydrogen-9.5
- nitrogen-3.2
- calcium-1.5
- phosphorus-1
- potassium, sulfur, sodium, chlorine, magnesium - less than 1%
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ion
an atom with a (+) or (-) charge
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cation
positively charged ion, fewer electrons
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anion
negatively charged ion, more electrons
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electron shell
the range the electron may move within. atoms may have up to 5 shells (2,8,8,8,8)
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valence shell
most outer electron shell if its full its more stable, if not it shares electrons
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ionic bond
anions and cations bonding together
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human body is made up of what 4 elements
hydrogen, carbon, oxygen, nitrogen
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