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Atom:
Smallest part of an element that keeps it unique. Nucleus is at the center, with electrons circling at various energy levels. Made of 3 particles.
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Protons:
+, found in nucleus, 1 amu
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Neutrons:
=, found in nucleus, 1 amu
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Electrons:
-, found in energy levels, amu 0
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Why is an atom neutral overall?
Protons and electrons with opposite charges have equal numbers in an atom.
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Element:
Substance that can't be broken into simpler substances
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Element:
- Made of one type of atom.
- Periodic Table lists all known elements.
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Atomic Symbol:
- 1st letter uppercase, 2nd lowercase
- e.g. Na
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Atomic #:
Protons in an atom, and electrons in an atom that haven't bonded
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Mass:
- Round to nearest whole # for most common mass.
- Mass # = p+ + n0
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Atomic Mass Unit:
Average mass of atoms
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7
N
Nitrogen
14.01
(Cell on Periodic Table)
- 7--Atomic #
- N--Element's symbol
- Nitrogen--Element's name
- 14.01--Atomic Mass
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