compound cards

Compound : pure substance made up of two or more different
elements chemically bonded together. They are hard
to separate. ( exs – salt, water and iron sulfide )


Chemical Formula: a representation of a molecule consisting of
chemical symbols, subscripts and coefficients.
( ex CO2 , N2 , 2NaSO3 )


Chemical Reaction: Is a process in which one substance or set of
substances, known as reactants are changed
into another substance or set of substances known as products.

element note cards

Element: A pure substance made up of only one kind of atom that can not be
broken down into a simpler form.

Chemical Symbol: a representation of the name of an element that consists of
one or two letters.

Periodic Table: A chart of all the known elements found on this earth which Dmitri
Mendeleev first developed in 1869.

Groups: The 18 vertical columns of elements on the table that organizes them into
families with similar chemical properties. The atoms of elements within a
group all have equal numbers of valence electrons.

Periods: The 7 horizontal rows of elements that show how the chemical properties
slowly change as you move across from one element to another. The
atomic number of the elements increases by one, therefore the electron
number increases as well.

Atom Note Cards

Atoms: Building blocks of matter

Atomic Number: number of protons in an atom

Mass Number: number of protons and neutrons in the nucleus of an atom

Proton: positively charged subatomic particle found in the nucleus of
an atom.

Neutron: neutral subatomic particle found in the nucleus of an atom.

Electron: negatively charged subatomic particle found on energy
levels outside the nucleus of an atom.

Valance Electrons: The electrons found on the outermost energy level
of an atom. Their number determines how an atom
will bond or not bond with other atoms.

Nucleus: the center of the atom which makes up the mass of the atom.

Neutral Atom: An atom that has an equal number of protons and electrons,
therefore it has no charge.

Ion: An atom that has an unequal number of protons and electrons,
therefore it has a charge.
An atom becomes an ion by either losing or gaining electrons.

Isotope: An atom that has the same number of protons, but different numbers
of neutrons. Isotopes have the same atomic number but different
atomic masses.