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Science Ch. 1 Sec.1
Chemical Interactions Elements and Atoms
Term | Definition |
---|---|
neutrons | small, unchanged particles that are found in the nucleus of an atom |
energy level | a region of an atom in which electrons of the same energy are likely to be found |
protons | small positively charged particles that are found in the nucleus of an atom |
nucleus | the central core of an atom containing protons and usually neutrons |
electrons | negatively charged particles that move around outside the nucleus of an atom |
model | physical, metal, visual, and other representation of an idea to help people understand what they cannot observe directly |
scientific theory | a well tested idea that explains and connects a wide range of observations |
atom | smallest particle of an element |
mixture | two or more substances elements compounds or both that are in the same place but are not chemically combined |
compound | a pure substance made up of two or more elements that are combined |
element | the simplest pure substances they cannot be broken down |
matter | anything that has mass and takes up space |