Science Explosion v4, chapter 7

Question Answer
alkalis bases that dissolve in water
atom smallest piece of an element
atomic mass sum of protons and neutrons
atomic number number of protons in an atom’s nucleus
atomic theory scientists ideas about atoms
chemical change another name for a chemical reaction
chemical reaction This occurs when molecules combine to create a new substance.
chemical symbols abbreviations for elements
chemistry study of matter
compound molecules produced by a reaction
element substance containing only one kind of atom
group vertical columns of table
indicator changes color when exposed to acid or base
ion atom that has gained or lost an electron
molecule atoms joined together
neutral pH of 7.0
particle accelerator atom smasher
period horizontal rows of periodic table
pH scale “power of hydrogen”; numbered from 0-14
stable When an atom's outermost shell is completely full so the shell is closed.

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