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Atoms, Ions, and Molecules

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Katelynn Dorn

on 27 August 2014

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Transcript of Atoms, Ions, and Molecules

"The Little Guys"
Atoms, Ions, and Molecules
Living things are made of atoms of different elements
An
atom
is the smallest basic unit of matter. It is made up of protons, neutrons and electrons.
Element
- made up of all one type of atom
96% of your body is made up of only four elements
Compound
- substance made of different elements bonded together in a certain ratio
Atoms share pairs of electrons in covalent bonds.
"It's not always a win or lose game."
-
covalent bond
- atoms share a pair of electrons
-2 atoms may share
several
pairs of electrons
Molecules
Molecules
- two or more atoms held together by covalent bonds
CO2 molecules- each oxygen atom shares two pairs of electrons with the carbon atom
diatomic molecules
- example: oxygen
Ions Form When Atoms Gain or Lose Electrons
Ion
- an atom that has gained or lost one or more electrons
Atoms with less electrons tend to lose them and atoms with more electrons tend to gain them.
Ionic bond
forms through an electrical force between oppositely charged ions. example NaCl
Full transcript