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Atoms
small particles that make up elements and compounds
Molecules
Two or more of the same atoms bonded together
Single Element Molecules
molecules made up of only one type of atom
Compounds
two or more different types of atoms that are chemically bonded
Covalent Electrons
bonds that involve sharing of a pair of electrons between two atoms
Ionic Bonds
bonds that involve the transfer of electrons between two atoms
Covalent Bonding
bonds that occur between two nonmetals
Ionic Bonding
bonds that occur between a metal and nonmetal
H2O
2 Hydrogen and 1 Oxygen
Na2O
2 Sodium 1 Oxygen
CO2
1 Carbon 2 Oxygen
CH4
1 Carbon 4 Hydrogen
NaCl
1 Sodium 1 Chlorine
What small particle makes up all substances?
an atom
How is a compound different from a molecule?
a compound is made up of two or more different elements chemically bonded while molecules are groups of atoms bonded which could be the same or different elements.
One of the properties of a pure substance is that they always exist in fixed proportions. How many hydrogen atoms are needed to form 5 water molecules?
10
Which substances form ionic bonds?
Nonmetals and metals
Which substances form covalent bonds?
substances of the same composition
