| ISOTOPE | Each of two or more forms of a chemical element whose nuclei contain equal numbers of protons but different numbers of neutrons (7) |
| ISOTOPES | Atoms with the same number of protons but different number of neutrons (8) |
| AVOGADRO | ____'s law: With equal temperature and pressure, equal volumes of two gases contain equal numbers of molecules |
| PRONG | One of the tines of a fork; or, by extension, each of two or three parts of an attack or operation (5) |
| ISOTONE | One of a group of atoms having the same number of neutrons but a different number of protons |
| FIVE | Third prime number; the number of sides of a pentagon; or the number of protons/electrons in a boron |
| DIGLOSSIA | Existence of two forms of a language within a community, especially a high or formal form and a low colloquial one (9) |
| LOBE | A roundish, flattish projection or pendulous part often each of two or more such parts divided by a fissure |
| ISOMER | Each of two or more compounds with the same formula but different arrangements of atoms (6) |
| PLASMA | Hot ionized material of which all stars are composed, made up of roughly equal numbers of positive ions and free electrons; sometimes regarded as the fourth state of matter (6) |
| NINETY | Represented in Roman numerals as XC, the number of protons or electrons in a thorium atom or the num |
| ALLOTROPE | Each of two or more different forms in which an element can exist (9) |
| ATOMIC | ___ number is equal to the number of protons present in the nucleus of the atom (6) |
| ALLELE | Any one of the two or more possible forms of a gene |
| ATOM | Unit of matter containing one or more electrons and a compact nucleus of protons and neutrons (4) |
| NUCLEUS | Positively charged central region of an atom, composed of protons and neutrons surrounded by a cloud of electrons (7) |
| MUTUAL | Concerning each of two or more people (6) |
| CORRELATE | Each of two or more connected things (9) |
| EVENPAR | What golfers with equal numbers of squares and circles on their scorecards shoot |
| DRAW | Finish a game with an equal number of points, goals, etc. (4) |
