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Vocab

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