Chemistry Crossword

3. A compound is a material formed from elements chemically combined in definite proportions by mass.
4. The study of matter and its transformations.
7. Pure NH3 is a colorless gas with a sharp, characteristic odor. It is easily liquified by pressure, and is very soluble in water.
9. Atoms or ions of an element with different numbers of neutronsin their atomic nucleus.
11. earthAn oxide of an alkaline earth metal, which produces an alkaline solution in reaction with water.
13. compoundA compound made of distinguishable cations and anions, held together by electrostatic forces.
14. number The total number of protons and neutrons in an atom or ion.
15. bond A covalent bond is a very strong attraction between two or more atoms that are sharing their electrons.
16. A metal is a substance that conducts heat and electricity, is shiny and reflects many colors of light, and can be hammered into sheets or drawn into wire.

1. An anion is a negatively charged ion.
2. An atom is the smallest particle of an element that retains the chemical properties of the element.
3. bond A chemical bond is a strong attraction between two or more atoms.
5. Spontaneous emission of particles or high-energy electromagnetic radiation from the nuclei of unstable atoms.
6. bond In the valence bond theory, a valence bond is a chemical bond formed by overlap of half-filled atomic orbitals on two different atoms.
8. rule A guideline for building Lewis structures that states that atoms tend to gain, lose, or share valence electrons with other atoms in a molecule until they hold or share eight valence electrons.
10. An atom or molecule that has acquired a charge by either gaining or losing electrons.
12. An element is a substance composed of atoms with identical atomic number.
15. A cation is a positively charged ion.