Chemistry terms

Across

3. the elements in Group #2 that have only 2 electrons in their valence shell; light, reactive earth metals that are fairly eager to give away their 2 valence electrons
4. Formula for a compound, element or molecule using the atomic symbols and demonstrate a combining ratio with the use of subscripts
6. capability to be hammered out thin, or pulled into thin wires or threads
7. Earth Metals
9. a set of crystal faces defined according to their relationship to the crystal axis; 3-D crystal lattice structure
12. All matter is composed of these; basic unit of an element
14. an element in the staircase in the periodic table; it possesses some metal properties and characteristics, and some non-metal properties and characteristics
16. Negative subatomic particle that orbits the atom; has no significant mass
18. quality or condition of being hard; particles close together and very dense; ability of a substance to resist deformation
19. an element to the left of the staircase on the periodic table, which is usually solid at room temperature, is solid, shiny, malleable and is, m a good conductor of electricity
20. Neutral subatomic particle found in the nucleus of the atom; has mass
21. a pure substance composed of two or more elements (types of atoms) in a fixed ratio
22. Gases elements in Group #18; very stable and do not react because their outer valence shell of electrons is already full, and their number of protons balance the number of electrons, so they carry no charge when stable
23. number of particles of a substance in a given volume; the more particles in a given volume, the denser the substance
26. Acid ability to receive or exchange a hydrogen proton with an acid; can be neutralized by an acid
27. a column of elements in the periodic table who all have the same number of valence (outer) electrons and therefore behave similarly
29. quality of a substance to be shaped into something else without breaking; ability of the molecules/particles of a substance to move over each other or change shape without breaking bonds
30. the temperature at which a substance changes from one state to another; related to a substance’s specific heat capacity
31. Metals the elements (except H) in Group #1 that have one electron in their valence shell; soft and highly reactive metals; eager to give away their one valence electron

Down

1. a model representing the arrangement of electrons in orbits around the nucleus of the atom
2. measure of a substance’s resistance to flow; low flow rate- high viscosity, high flow rate- low viscosity
5. is a pure substance where all the atoms are the same and the substance cannot be broken down into simpler substances
8. an element to the right of the staircase on the periodic table, which is usually dull, brittle and does not conduct electricity well; it can solid, liquid or gas at room temperature
10. elements in Group #17, most reactive group of elements, desperately want to gain one more electron so that their valence shell will be full; high electronegativity (pull for electrons)
11. measure of how easily a substance bursts a flame through fire or combustion
13. Solid, Liquid or gas; defined by the spaces between particles as determined by the kinetic energy of the particles (speed at which they move)
15. ability of a substance to chemically change when exposed to light; degradation due to energy contained in light waves
17. Positive subatomic particle that is found in the nucleus of the atom; has mass
24. Overall equation of a chemical reaction using chemical formulas for all reactants and products; where coefficients appear in front of the formulas for the compounds involved which indicate the ratios at which the compounds react when balanced
25. property of a substance where it can be dissolved into a solvent (usually water)
28. a row of elements in the periodic table; refers to the energy level of the valence (outer most) shell of electrons or distance of them from the nucleus