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Vocab

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