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Chemistry Test Review

Across
One of the two sources of energy for the earth
The procedure of calculating the absolute ages of rocks and minerals that contain radioactive isotopes
These move slow or fast depending on if they are heated or cooled
A substance formed by the chemical combination of two or more elements in definite proportions and usually having properties different from those of its constituent elements
Why atoms bond
One of several distinct regions around the nucleus of an atom where electrons are located (periods or rows on the periodic table)
A bond that forms when electrons are shared by metal ions
An atom or a molecule that possesses an electrical charge
Mass can not be created or destroyed
Gaining electrons
A substance that cannot be broken down into simpler substances by ordinary chemical or physical means
The transfer of heat through matter by molecular activity; Energy is transferred through collisions from one molecule to another
Loss of electrons
All matter is composed of atoms or molecules that have energy of motion
Down
Method for determining age by comparing the amount of carbon-14 to the amount of carbon-12 in a sample
The transfer of energy (heat) through space by electromagnetic waves (
A bond that forms when atoms share electrons
One of the two sources of energy for the earth
The number of protons in the nucleus of an atom
An atom with the same number of protons but different numbers of neutrons for a given element; an isotope's mass number is different from that of the given element
A measure of the average kinetic energy of individual atoms or molecules in a substance
The elements in a column, family, or group, on the periodic table that share characteristics
An unstable nucleus of a radioactive isotope causes this
The spontaneous decay of certain unstable atomic nuclei
The transfer of heat by the movement of a mass or substance; It can take place only in fluids
A bond that forms between negative and positive ions
Atoms of the same element and have a positive charge