Studied by 9 people
chemical formula
A combination of chemical symbols and numbers to represent a substance
chemical equation
A short, easy way to show a chemical reaction, using symbols.
reactants
A starting material in a chemical reaction
product
A substance produced in a chemical reaction
state symbols
solid (s), liquid (l), gas (g), and aqueous (aq)
aqueous
dissolved in water
ionic equations
shows only the particles that react and the products they form
hazard symbols
warnings printed on containers to indicate that either the container or the product is dangerous
oxidising
corrosive
toxic
highly flammable
harmful
enviromental hazard
John dalton
described atoms as a solid sphere
Plum pudding model
J.J Thomsons model of an atom, in which he thought electrons were randomly distributed within a positively charged cloud
nuclear model
Model of the atom with a nucleus containing protons and neutrons and with electrons in the space outside the nucleus
Bohr model
model of the atom in which electrons move rapidly around the nucleus in paths called cells
relative masses
Proton - 1
Neutron - 1
Electron - 0.0005
Relative charges of subatomic particles
Proton: +1
Neutron: 0
Electron: -1
mass number
the sum of the number of neutrons and protons in an atomic nucleus
atomic number
the number of protons in the nucleus of an atom
elements
A molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions.
isotopes
Atoms of the same element that have different numbers of neutrons and same number of protons
relative atomic mass
The weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of carbon-12
Mendeleev's periodic table
arranged by atomic mass and left gaps for undiscovered elements
modern periodic table
elements are arranged in order of increasing atomic number
group number
The number of electrons in the outer shell
period number
number of shells
Note 
Flashcard (29)