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23 Cards in this Set

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Definiton of PROTONS?
Postitivly charged and packed tightly with neutrons to form a dense core, or nucleus, at the center of the atom.
Definiton of ELECTRONS?
Negativly charged, and move about the nucleus at nearly the speed of light.
Definiton of DALTON?
A unit of measurement in honor of John Dalton, the British scientist who helped develop atomic theory around 1800.
Definiton of ATOMIC NUMBER?
The number of protons in the nucleus of an atom. unique for each element and designated by a subscript to the left of the elemental symbol.
Definiton of ATOMIC WEIGHT?
The total mass, which is the mass in grams of one mole of the atom.
Definiton of ISOTOPES?
The different atomic forms of the element.
Definiton of MATTER?
Anything that takes up space and has mass.
Definition of ELEMENT?
A substance that cannot be broken down to other substances by chemical rections.
Definiton of COMPOUND?
Two or more emements may combine in a fixed ratio to produce a COMPOUND.
Definiton of TRACE ELEMENTS?
Required by an organism in minute quantities.
Definiton of a Neutron?
Neutrally charged and packed tightly with protons to form a dense core, or nucleus, at the center of the atom.
Definiton of RADIOACTIVE ISOTOPE?
One in which the nucleus decays spontaneously, giving off particles and energy.
Definiton of ENERGY?
The ability to do work.
Definiton of POTENTIAL ENERGY?
The energy that matter stored because of it's position or location.
Definiton of ENERGY LEVELS (ELECTRON SHELLS)?
The different states of potential energy for electrons in an atom.
The definition of ORBITAL?
The three dementional space where an electron is found 90% of the time.
Definiton of VALENCE ELECTRONS?
The outer electrons.
Definiton of VALENCE SHELL?
The outermost energy shell.
Definiton of STRUCTURAL FORMULA?
A type of molecular notation in which the constituent atoms are joined by lines representing covalent bonds.
Definiton of CHEMICAL BONDS?
Interactions that result in atoms staying close together, held by these attractions.
The definiton of COVALENT BONDS?
The sharing of a pair of valence electrons by two atoms.
The definiton of MOLECULAR FORMULA?
A type of molecular notation indicating only the quantity of the constituent atoms.
The definiton of a DUBBLE COVALENT BOND?
Two oxygen atoms form a molecule by sharing two pairs of valence electrons cause the joining of atoms.