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12 Cards in this Set
- Front
- Back
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Matter
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we classify
matter in three categories solids liquids and gases all objects in the universe are made up of matter |
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Physical Properites
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These are Properties of matter which we can observe without changing the composition of an element. examples density color hardness freezing and boiling point
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Chemical properties
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These are the properties that describe how an element interacts with others at the molecular level to produce different kinds of matter
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Atoms
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all elements in the periodic table are made up of atoms. Atoms are the smallest unit of the element.
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Subatomic particle
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parts atoms are made of there three kinds of subatomic particles protons neutrons and electrons
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electrons
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carry a negative electrical charge and move around in the electron cloud.
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protons
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protons form closely together with neutrons to forn tge necules protons carry a positive charge
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neutrons
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neutrons are found in the necules along with protons netrons carry no electrical charge so they are neutral
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nucleus
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found in the center of an atom and consists of protons and neutrons
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electron cloud
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area in which electrons move around the nucleas . The electrons have a negative charge
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Atomic number
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this number is equal to the number of protons in an atom number is also shown on the top of the perodic table
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mass number
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equal to the sum of protons and neutrons and is shown on the bottom of perodic table
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