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Vocab

Across
Need to know the amount of energy present
Total number of protons and neutrons in a nucleus
A positively charged, stable subatomic particle
Characteristics that can be observed with the eye
Two or more forms of the same element that contain equal number of protons but different number of neutrons in the nuclei
High vacuum tube used in tvs and computers
Down
Properties of an element
Atomic mass Unit, unit of mass
Any material observed during a reaction in which material changes.
A negatively charged, stable subatomic particle
Number of protons in the nucleus of an atom
A neutrally charged, stable subatomic particle