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| 94977315 | Matter | anything that takes up space and has mass | |
| 94977316 | Element | any substance that cannot be broken down into simpler substances | |
| 94977317 | Compound | a substance that contains two or more elements chemically combined in a fixed ratio | |
| 94977318 | Trace Elements | those required by an organism in only minute quantities | |
| 94977319 | Atom | smallest unit of matter that still retains the properties of an element | |
| 94977320 | Neutrons | the particles of the nucleus that have no charge | |
| 94977321 | Protons | positively charged particles in the nucleus of an atom | |
| 94977322 | Electrons | These have a negative charge and orbit the nucleus | |
| 94977323 | Atomic Nucleus | the center of an atom | |
| 94977324 | Dalton | unit of measurement used for atoms and subatomic particles | |
| 94977325 | Atomic Number | the number of protons in the nucleus of an atom | |
| 94977326 | Mass Number | the sum of the number of neutrons and protons in an atomic nucleus | |
| 94977327 | Atomic Mass | An approximation of the total mass of an atom | |
| 94977328 | Isotopes | atoms of the same element that have different numbers of neutrons | |
| 94977329 | Radioactive Isotope | An isotope whose nucleus decays spontaneously, giving off particles and energy. | |
| 94977330 | Energy | capacity to cause change | |
| 94977331 | Potential Energy | energy that matter possesses because of its location or structure | |
| 94977332 | Energy Levels | The different states of potential energy that electrons have in an atom | |
| 94977333 | Electron Shells | an energy level representing the distance of an electron from the nucleus of an atom. | |
| 94977334 | Valence Electrons | electrons on the outermost energy level of an atom | |
| 94977335 | Valence Shell | outermost electron shell | |
| 94977336 | Orbital | a region of space around the nucleus where an electron is likely to be found | |
| 94977337 | Covalent Bond | a chemical bond that involves sharing a pair of electrons between atoms in a molecule | |
| 94977338 | Chemical Bond | the force that holds two atoms together | |
| 94977339 | Molecule | two or more atoms held together by covalent bonds | |
| 94977340 | Single Bond | a covalent bond in which two atoms share one pair of electrons. | |
| 94977341 | Structural Formula | an expanded molecular formula showing the arrangement of atoms within the molecule | |
| 94977342 | Molecular Formula | a chemical formula that shows the number and kinds of atoms in a molecule, but not the arrangement of the atoms. | |
| 94977343 | Double Bond | a covalent bond in which two pairs of electrons are shared between two atoms | |
| 94977344 | Valence | the bonding capacity of a given atom; usually equals the number of unpaired electrons required to complete the atom's outermost (valence) shell. | |
| 94977345 | Electronegativity | the attraction of an atom for the electrons of a covalent bond | |
| 94977346 | Non polar covalent bond | bond where electrons are shared equally | |
| 94977347 | polar covalent bond | a covalent bond in which electrons are not shared equally | |
| 94977348 | Ion | a charged atom | |
| 94977349 | Anion | a negatively charged ion | |
| 94977350 | Cation | a positively charged ion | |
| 94977351 | Ionic Bond | a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion | |
| 94977352 | Ionic Compound | Compound formed of ionic bonds | |
| 94977353 | 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. | |
| 94977354 | Van der Waals interactions | weak attractions that occur only when atoms and molecules are very close together | |
| 94977355 | Reactants | the starting materials in a chemical reaction | |
| 94977356 | Products | Ending materials in a chemical reaction. | |
| 94977357 | Chemical Equilibrium | in a reversible chemical reaction, the point at which the rate of the forward reaction equals the rate of the reverse reaction. |
