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Defend Earth from alien invaders
anything that takes up space and mass
substance that cannot be broken down to other substances by chemical reaction
substance consisting of two or more different elements combined in a fixed ratio
an element indispensable for life but required in extremely minimum amounts
The smallest unit of matter that still retains the properties of an element
the particles of the nucleus that have no charge
positively charged particles in the nucleus of an atom
negatively charged particles found outside the nucleus
atom's dense central core, containing protons and neutrons
measure of mass for atoms and subatomic particles; the same as the atomic mass unit, or amu
the number of protons in the nucleus of an atom
the sum of the number of neutrons and protons in an atomic nucleus
total mass of an atom, which is the mass in grams of 1 mole of the atom
atoms of the same element that have different numbers of neutrons
isotope that is unstable; nucleus decays spontaneously, giving off detectable partices and energy
capacity to cause change, especially to do work (move matter against an opposing force)
emergy that matter possesses as a result of its location or spatial arrangement (structure)
energy level of electrons at a characteristic avg. distance from nucleus of atom
The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds.
The outermost energy shell of an atom, containing the valence electrons involved in the chemical reactions of that atom.
3 dimensional space where an electron is found 90% of the time
an attraction between two atoms resulting from the sharing of outer-shell electrons or the presence of opposite charges
two or more atoms held together by covalent bonds
a single covalent bond; the sharing of a pair of valence electrons by two atoms.
A type of molecular notation in which the constituent atoms are joined by lines representing covalent bonds.
a type of molecular notation representing the quantity of constituent atoms, but not the nature of the bonds that join them.
a double covalent bond; the sharing of two pairs of valence electrons by two atoms.
the bonding capacity of a given atom; usually equals the number of unpaired electrons required to complete the atom's outermost (valence) shell.
The attraction of a given atom for the electrons of a covalent bond.
nonpolar covalent bond
A type of covalent bond in which electrons are shared equally between two atoms of similar electronegativity.
polar covalent bond
A covalent bond between atoms that differ in electronegativity. The shared electrons are pulled closer to the more electronegative atom, making it slightly negative and the other atom slightly positive.
an atom orgroup of atoms that has gained or lost one more electrons; thus acquiring a charge
a positively charged ion
a negatively charged ion
a chemical bond resulting from the attraction between oppositely charged ions.
ionic compounds or salts
A compound resulting from the formation of an ionic bond.
A type of weak chemical bond formed when the slightly positive hydrogen atom of a polar covalent bond in one molecule is attracted to the slightly negative atom of a polar covalent bond in another molecule.
van der Waals interactions
Weak attractions between molecules or parts of molecules that are brought about by localized charge fluctuations.
in a chemical reaction, the state in which the rate of the forward reaction equals the rate of the reverse reaction, so that the relative concentrations of the reactants and products do not change with time.
sharing of a pair of valence electrons by two atoms.
The making and breaking of chemical bonds, leading to changes in the composition of matter.
the starting materials in a chemical reaction
Ending materials in a chemical reaction.
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