Across
- 5. Members of a family of an element that all have the same number of protons but different numbers of neutrons.
- 6. Any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table.
- 7. Not likely to give way or overturn; firmly fixed.
- 10. a fundamental constant that is the smallest known quantity of electricity and that has a value (either positive or negative) of 1.602176634 ×10-19 coulombs.
- 11. The small, dense region consisting of protons and neutrons at the center of an atom.
- 13. A theory of matter and energy based on the concept of quanta, especially quantum mechanics.
- 14. A group of electrons circulating around a nucleus or a molecule.
- 19. A part or aspect of something abstract, especially one that is essential or characteristic.
- 20. A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
- 21. An atom or group of atoms in which the number of electron s is different from the number of protons.
- 23. A thing that is composed of two or more separate elements; a mixture.
- 24. A negatively charged particle, located in the outermost shell of an atom, that can be transferred to or shared with another atom.
- 25. A substance made by mixing other substances together.
- 27. Any of the six chemical elements that make up Group 1 (Ia) of the periodic table.
- 28. An element (e.g. arsenic, antimony, or tin) whose properties are intermediate between those of metals and solid nonmetals or semiconductors.
- 30. A characteristic of a unit of matter that expresses the extent to which it has more or fewer electrons than protons.
- 32. Mass Unit- Atomic weight is measured in atomic mass units (amu), also called daltons.
- 33. The number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus.
Down
- 1. The time interval between two successive repetitions.
- 2. the tendency, quality, or fact of recurring at regular intervals.
- 3. The sum of the numbers of protons and neutrons present in the nucleus of an atom.
- 4. Any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table.
- 8. Any of the six chemical elements that comprise Group 2 (IIa) of the periodic table.
- 9. Subatomic particles found inside the nucleus of every atom.
- 12. Any of various chemical elements that have valence electrons
- 15. A subatomic particle found in the nucleus of every atom.
- 16. A set of objects with an operation * .
- 17. A table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
- 18. A substance having a finite activation energy (band gap) for electron conduction.
- 22. Any of a class of substances characterized by high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light.
- 26. Emitting or relating to the emission of ionizing radiation or particles.
- 29. The fixed amount of energy that a system described by quantum mechanics, such as a molecule, an atom, electron, or nucleus, can have.
- 31. The basic unit of a chemical element.