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Definition
| smallest part of an element |
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Definition
| positive particle in the nucleus |
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Definition
| neutral particle in the nucleus |
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Definition
| negative particle in the cloud around the nucleus |
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Definition
| center of the atom, contains the mass |
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Definition
| pure substance containing only one type of atom |
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Term
| Periodic Table of Elements |
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Definition
| organizes elements by increasing atomic numbers, into 18 groups or families and in 7 periods that show repeating properties |
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Definition
| # of protons in the nucleus of an atom, used to identify the element |
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Definition
| sum of protons and neutrons in an atom |
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Definition
| atom of an element that has a different number of neutrons |
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| horizontal row in the Periodic Table, shows repeated changes from left to right |
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| vertical column in the Periodic Table, contains similar elements |
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| name of a group of elements that are similar but not the same |
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Definition
| contains information about a specific element |
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Definition
| one or more letters that represent an element, the first is capital and the rest is lower case |
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Definition
| Russian chemist who first organized the elements into a table, by increasing atomic mass |
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| characteristic of an element, such as state of matter or reactivity |
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Definition
| describes an element's obvious characteristics, such as color and state |
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Term
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Definition
| describes an element's reactivity, such as flammability or acidity (not always obvious) |
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