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-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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-Number of protons in the nucleus
-atomic number NEVER changes
-the top number in the periodic table. |
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- are the simplest pure substance
-cannot be changed into simpler substances by heating or by a chemical process
-are made of ONE KIND of atom |
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-space where electrons circle the nucleus
-electrons spin very quickly around the nuceus in many directions; upwards, downwards, sideway. |
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| Two or more atoms of the same element that have different numbers of neutrons bu the same number of protons |
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Definition
"ANYTHING THAT HAS MASS AND TAKES UP SPACE and is made up of different kinds of atoms; includes all things that can be seen, tasted, smelled, or touched but does not include heat, sound, or light"
-WHAT ALL OBJECTS ARE MADE OF |
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Definition
The basic building blocks of matter that makes up every day objects
-90 naturally occuring kinds of atoms |
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Definition
| negatively charged subatomic particle |
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Definition
| special unit to measure mass of a subatomic particle |
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Definition
the center of the atom
-makes up 99.9% of the mass of the atom
-made up of protons and neutrons |
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Definition
| an organized chart to display all known elements |
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Definition
| an atom with an electrical charge |
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Definition
have a definite shape and a definite volume
-atoms are packed very close together to keep its own shape |
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Definition
have no definite shape but have a definite volume
-atoms are close together but are free to move and change position
-fills the shape of any container |
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Definition
has no definite shape and no definite volume
-particles are in constant motion and are much farther apart than atoms in solids or liquids
-have high amounts of energy
-atoms can be pushed close together or can be stread out to fill a large area |
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Definition
| neutral charge particle found in the nucleus of an atom |
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| pure substances made up of two or more elements chemically combined |
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| has the same amount of electrons as protons; they are equal |
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| the force that holds atoms together in a compound |
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| form between positive and negative ions; electrons are completely transferred from one atom to another |
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| occurs when two or more elements share electrons |
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Definition
| form when electrons are shared by metal ions |
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