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Discovering The Atom
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What is an example of matter that can be a solid, liquid, and gas?
water
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How many electrons does this element have? (charge=0)
73
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What is the atomic number of this element?
73
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What is an atom?
An atom is the smallest unit of matter.
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Element "H" stands for...
Hydrogen
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What type of molecule has a positive charge?
proton
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Who believed matter was made up of water, earth, fire, and air?
aristotle
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How many protons does this element have?
73
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Element "Na" stands for
Sodium
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Element "N" stands for...
Nitrogen
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How many electrons does this element have? (charge = -10)
92
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How protons does this element have?
82
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What is matter?
A physical substance that has mass or takes up space.
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What type of charge does a neutron have?
no charge
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How many neutrons does this element have?
108
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What are the 3 types of matter?
solid, liquid, and gas
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How many neutrons does this element have?
125
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Why are electrons outside of the nucleus?
Electrons are outside the nucleus and orbit about it because they are attracted to the positive charge in the nucleus.
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Who believed atoms cannot be divided, created, or destroyed.
Democritus and Dalton
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Element "Ca" stands for...
Calcium
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What is the atomic mass of this element?
207
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What molecules are inside of the nucleus of an atom?
neutron and protons
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