Chapter 2 Essential Vocabulary Crossword

3. negative ion formed by an atom gaining one or more electron
8. positively charged particle that resides in the atom's nucleus
9. anything that has mass and occupies space
11. substance composed of molecules consisting of atoms of at least two different elements
12. 1 of 118 substances that can't break down into smaller substances
13. power derived from the utilization of physical or chemical resources, especially to provide light & heat or to work machines
14. molecule that takes part in a chemical reaction
16. negatively charged subatomic particle that resides outside the nucleus in electron orbital
17. condition in the course of a reversible chemical reaction in which no net change in amounts of reactants & products occurs
18. chemical bond that forms between ions with opposite charges
20. 1 or more forms of an element that have different numbers of neutrons
21. a strong bond formed between two atoms of the same of different elements; forms when electrons are shared between atoms
22. stored energy that depends upon the relative position of various parts of a system
23. ability of some elements to attract electrons, acquiring partial negative charges in molecules & creating partial positive charges on the hydrogen atoms

1. outermost shell of an atom
2. chemical bond in which two pairs of electrons are shared between two atoms
4. the smallest unit of matter that retains all the chemical properties of an element
5. a formula which shows the arrangement of atoms in the molecule of a compound
6. positive ion formed by an atom losing one or more electrons
7. very weak interaction between molecules due to temporary charges attracting atoms that are very close together
8. molecule that is result of chemical reaction
10. weak bond between slightly positively charged hydrogen atoms & slightly negatively charged atoms in other molecules
15. 2 or more atoms chemically bonded together
19. atom or chemical group that doesn't contain equal numbers of protons & electrons