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| the smallest particle into which an element can be divided and still be the same substance |
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| negatively charged particles that Thomson discovered |
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| in the center of the atom is a tiny, extremely dense, positively charged part |
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| regions inside the atom where electrons are likely to be found |
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| positively charged particles in the nucleus |
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| The SI unit used to express the masses of particles in atoms |
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| particles of the nucleus that have no electrical charge |
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| The number of protons in the nucleus of an atom |
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| atoms that have the same number of protons but have different numbers of neutrons |
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| the sum of the protons and neutrons in an atom. |
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| The weighted average of the masses of all the naturally occurring isotopes of that element |
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| Pulls objects toward each other. |
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| Causes objects with the same charges to repel from each other, and with different charges they attract. |
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| An important force in radioactive atoms, it plays a key role in the change of a proton to a neutron or electron. |
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| Thomson thought that electrons were mixed throughout an atom, like plums in a pudding |
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All substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed.
Atoms of the same element are exactly alike, and atoms of different elements are different.
Atoms join with other atoms to make new substances. |
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| A set of ideas meant to describe something based on someone's own suppositions, or experiments. |
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| Bohr made a model of an atom that showed the number of protons,neutrons, and electrons. He is kind of responsible for the electron cloud. |
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| Thought that matter is composed of atoms |
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| Gravitational, Strong, and Weak |
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| A greek word meaning, unable to be divided, indivisible |
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| A representation of an object or system that is smaller than or bigger than that actual object |
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| Each proton and neutron have____ amu |
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| Protons and Neutrons= what?? |
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