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12 Cards in this Set
- Front
- Back
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matter?
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substance of which a physical object is composed
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what is a element?
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a substance that has weight and takes up space and cannot be broken down by chemical means, matter in its simplest form
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What is a atom?
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the smallest particle of an element that can exist alone or in combination. All matter is made up of atoms
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what is a molecule?
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the smallest particle of a substance that has the properties of that substance.
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What is the nucleus ?
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Central part of a atom
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What are electrons?
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negatively charged particle that orbits around the nucleus
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What is a proton?
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Positively charged particle
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atom consists of?
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nucleus - consists of protons and neutrons
protons neutron electron |
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When are atoms considered neutral?
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when they have the same number of protons and electrons
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what are free electrons?
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electrons that are knocked out of the valence orbit
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direct current?
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current that flows in one direction. It is the type of current that is produced by a dry cell battery
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alternating current
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reverses its direction at regular intervals
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