Module 4 Crossword

3. a form of chemical connection in which one atom loses valence electrons and gains them from another
5. the time required for half of something to undergo a process
8. a chemical bond that involves the sharing of electrons to form electron pairs between atoms.
11. a measurement of the amount of matter an object contains
12. a group of two or more atoms held together by chemical bonds
13. the smallest particle that can include the chemical properties of an element
15. the process by which an unstable atomic nucleus loses energy through radiation

1. a tabular array of the chemical elements organized by atomic number
2. the number of a chemical component of the periodic system and on the periodic table that equals the number of protons in the nucleus of the atom.
4. a substance that cannot be broken down into a more straightforward format
6. distinct nuclear species of the same element.
7. a substance of two or more different chemical elements combined in a fixed ratio.
9. represents the electrostatic attraction between hydrogen and an electronegative atom
10. anything that occupies space and has mass
14. the total number of protons and neutrons in a nucleus.