Terms : Hide Images
| 4899453047 | ammonia | A small and very toxic nitrogenous waste produced by metabolism | 0 | |
| 4899453068 | anion | A negatively charged ion | 1 | |
| 4899454946 | atom | The smallest unit of matter that retains the properties of an element | 2 | |
| 4899454947 | atomic mass | total atomic mass, or mass in grams of one mole of an atom | 3 | |
| 4899456839 | atomic nucleus | an atom's central core containing protons and neutrons | 4 | |
| 4899456840 | 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 | 5 | |
| 4899458662 | cation | An ion with a positive charge, produced by the loss of one or more electrons | 6 | |
| 4899458663 | chemical bond | An attraction between two atoms resulting from a sharing of outer-shell elctrons or the presence of opposite charges on the atoms; the bonded atoms gain complete outer electron shells | 7 | |
| 4899461322 | chemical equilibrium | In a reversible chemical reaction, the point at which the rate of the forward reaction equals the rate of the reverse reaction | 8 | |
| 4899463309 | chemical reaction | A process leading to chemical changes in matter; involves the making and/or breaking of chemical bonds | 9 | |
| 4899463310 | compound | A chemical combination, in a fixed ratio, of two or more elements | 10 | |
| 4899465440 | covalent bond | A chemical bond formed as a result of the sharing of one or more pairs of electrons | 11 | |
| 4899465441 | dalton | The atomic mass unit; a measure of mass for atoms and subatomic particles | 12 | |
| 4899465442 | double bond | a type of covalent bond in which two atoms share share two pairs of electrons | 13 | |
| 4899467534 | electron | A particle with a single negative charge; one or more electrons orbit the nucleus of the atom | 14 | |
| 4899467535 | electron shell | An energy level at which an electron orbits the nucleus of an atom | 15 | |
| 4899470494 | electronegativity | The tendency for an atom to pull electrons toward itself | 16 | |
| 4899470495 | element | Any substance that cannot be broken down to any other substance | 17 | |
| 4899470496 | energy | the capacity to do work | 18 | |
| 4899472911 | hydrogen 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 | 19 | |
| 4899472912 | ion | An atom that has gained or lost electrons, thus acquiring a charge | 20 | |
| 4899472913 | ionic bond | A chemical bond resulting from the attraction between oppositely charged ions | 21 | |
| 4899476144 | ionic compound | compound resulting from the formation of ionic bonds, also called salts | 22 | |
| 4899476145 | isotope | One of several atomic forms of an element, each containing a different number of neutrons and thus differing in atomic mass | 23 | |
| 4899476146 | mass number | The sum of the number of protons and neutrons in an atom's nucleus | 24 | |
| 4899478828 | matter | Anything that takes up space and has mass | 25 | |
| 4899478829 | molecular formula | A type of molecular notation indicating only the quantity of the constituent atoms | 26 | |
| 4899478830 | molecule | Two or more atoms held together by covalent bonds | 27 | |
| 4899481370 | neutron | An electrically neutral particle (a particle having no electrical charge), found in the atom | 28 | |
| 4899481371 | nonpolar covalent bond | A type of covalent bond in which electrons are shared equally between two atoms of similar electronegativity | 29 | |
| 4899486668 | nucleus | (1) An atom's central core, containing protons and neutrons. (2) The chromosome-containing organelle of a eukaryotic cell. (3) A cluster of neurons | 30 | |
| 4899486669 | orbital | In the current model of atomic structure, the volume of space surrounding the atomic nucleus in which an electron will be found 90 percent of the time | 31 | |
| 4899488834 | polar covalent bond | A type of 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 | 32 | |
| 4899488835 | potential energy | The energy stored by matter as a result of its location or spatial arrangement | 33 | |
| 4899490690 | product | An ending material in a chemical reaction | 34 | |
| 4899490691 | proton | A subatomic particle with a single positive electrical charge, found in the nucleus of the atom | 35 | |
| 4899490692 | radioactive isotope | A method paleontologists use for determining the ages of rocks and fossils on a scale of absolute time, based on the half-life of radioactive isotopes | 36 | |
| 4899493390 | reactant | A starting material in a chemical reaction | 37 | |
| 4899493391 | salt | Compounds resulting from the formation of ionic bonds, also called an ionic compound | 38 | |
| 4899493392 | single bond | A single covalent bond; the sharing of a pair of valence electrons by two atoms | 39 | |
| 4899496147 | structural formula | a type of molecular notation in which the constituent atoms are joined by lines representing covalent bonds | 40 | |
| 4899496148 | theory | A generalization based on many observations and experiments; a verified hypothesis | 41 | |
| 4899496149 | trace element | An element indispensable for life but required in extremely minute amounts | 42 | |
| 4899498042 | valence | The bonding capacity of a given atom generally equal to the number of unpaired electrons in the atom's outermost shell | 43 | |
| 4899498043 | valence electron | the electrons in the outermost electron shell | 44 | |
| 4899498044 | valence shell | The outermost energy shell of an atom, containing the valence electrons involved in the chemical reactions of that atom | 45 | |
| 4899501911 | van der Waals interaction | Weak attractions between molecules or parts of molecules that are brought about by localized charge fluctuations | 46 |
