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22 Cards in this Set
- Front
- Back
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Define atom.
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The smallest unit of an element that has all the properties of that element.
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What is the atomic theory?
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A theory that all matter is matter is made up of tiny particles called atoms.
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How do atoms differ from one another?
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Each has a different number of protons in its nucleus.
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Which subatomic particle has no charge at all?
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neutron
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If an atom has more protons than electrons, then what is the atom's charge?
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positive
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Scientists know that atoms are made up of even smaller particles called__________.
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subatomic particles
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Where is almost all of an atom's mass?
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In it's nucleus
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What is the very tiny center of an atom?
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nucleus
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How many atoms must be linked together to form a molecule?
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2 or more
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Which subatomic particle has a positive charge?
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proton
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If an atom has more electrons than protons, then what is the atom's charge?
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negative
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What is the nucleus made up of?
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protons & neutrons
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Why is gold considered an element?
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Because it is made up of only one kind of atom.
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The paths in which the electrons move are called_____.
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orbits
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Where low-energy electrons orbit?
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Close to the nucleus.
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Which subatomic particle has a negative charge?
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electron
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What is an atom called that has the same number of protons and electrons?
Why? |
neutral
Because a positive and negative charge cancel each other out. |
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Where do high-energy electrons orbit?
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Farther away from the nucleus.
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What are the five properties of metals?
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1) have luster
2) are malleable 3) are ductile 4) conducts electricity 5) conducts heat |
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Why are orbits also referred to as energy levels?
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Because their distance from the nucleus depends on the energy of the electrons in them.
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Define element.
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A substance made up of only one kind of atom.
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Which is NOT a part of an atom?
protons, neutrons, electrons, elements |
elements
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