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Definition
| the total number of protons and neutrons in the nucleus of an atom - each element has its own mass number |
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Definition
| positively charged subatomic particle located in the nucleus of an atom. It is counted to identify the atomic number |
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Definition
| number of protons in the nucleus -atomic number NEVER changes - the top number in the periodic table |
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Definition
| space where electrons circle the nucleus |
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Definition
| are the basic building blocks of matter that makes up everyday objects |
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Definition
| particles SMALLER than an atom - 3 basic parts are the protons,neutrons and electrons |
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| special unit to measure mass of a subatomic paricle |
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Definition
| the center of the atom - make up of the proton and neutron - makes up 99.9% of the mass of an atom |
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Definition
| negatively charged subatomic particle located in the electron cloud. |
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Definition
| has the same amount of electrons as protons; they are equal. |
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Term
| Energy levels or electron levels |
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Definition
| the specific place in the electron cloud where an electron is found- the energy level is the distance from the nucleus that the electron spins. |
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Definition
| smaller particles found inside the proton and neutron of an atom |
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Definition
| an organized chart to display all known elements |
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