Terms : Hide Images
| 94174477 | atom | the smallest unit of matter that retains the properties of an element | 0 | |
| 94174478 | atomic mass | the total mass of an atom, which is the mass in grams of 1 mole of the atom | 1 | |
| 94174479 | 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 | 2 | |
| 94174480 | covalent bond | a type of strong chemical bond in which two atoms share one or more pairs of valence electrons | 3 | |
| 94174481 | electron | a subatomic particle with a single negative electrical charge and a mass about 1/2000 that of a neutron or proton. One or more electrons move around the nucleus of an atom. | 4 | |
| 94174482 | electronegativity | the attraction of a given atom for the electrons of a covalent bond | 5 | |
| 94174483 | hydrogen bond | a type of weak chemical bond that is 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. | 6 | |
| 94174484 | ionic bond | a chemical bond resulting from the attraction between oppositely charged ions | 7 | |
| 94174485 | isotope | one of several atomic forms of an element, each with the same number of neutrons, thus differing in atomic mass | 8 | |
| 94174486 | mass number | the sum of the number of protons and neutrons in an atom's nucleus | 9 | |
| 94174487 | neutron | a subatomic particle having no electrical charge (electrically neutral), with a mass of about 1.7 x 10-24 g, found in the nucleus of an atom. | 10 | |
| 94174488 | nonpolar covalent bond | a type of covalent bond in which electrons are shared equally between two atoms of similar electronegativity | 11 | |
| 94174489 | 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. | 12 | |
| 94174490 | proton | a subatomic particle with a single positive electrical charge, with a mass of about 1.7 x 10-24 g, found in the nucleus of an atom | 13 | |
| 94174491 | radioactive isotope | an isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy | 14 | |
| 94174492 | Trace element | an element indispensable for life but required in extremely minute amounts | 15 | |
| 94174493 | valence electron | an electron in the outermost electron shell | 16 | |
| 94174494 | valence shell | the outermost energy shell of an atom, containing the valence electrons involved in the chemical reactions of that atom | 17 | |
| 94174495 | van der Waals interactions | weak attractions between molecules or parts of molecules that result from localized charge fluctuations | 18 |
