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| Smallest particle that is still an element. Consists of: proton and neutron in the nucleus and electrons |
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| Atomic number of an element is determined by the number of __________ in the nucleus. |
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| Define or Draw: Brownian Motion |
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| Random movement observed among microscopic particles suspended in a fluid medium |
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| Show me a Chemical formula |
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Definition
| H2O A description that uses numbers and symbols of elements to describe the proportions of elements in a compound or reaction |
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| A chemical substance made of atoms of two or more different elements combined in a fixed proportion. H2O, CO2 |
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| Define and give an example of an Element |
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| A substance made of only one kind of atom. C - carbon |
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| In the periodic table – elements in the same column. Outermost electrons are arranged similarly |
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| An atom with a net electric charge due to the loss or gain of electrons. |
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| Same atomic # for element, but different atomic mass |
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| Show a molecule that uses one kind of atom |
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| Electrically neutral nucleon that is in an atomic nucleus |
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| The principal building block of the nucleus. Composed of quarks. If it is electrically neutral it is called a neutron. If it is electrically charged it is called a proton |
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| A. Positively charged center of an atom. B. Contains protons and neutrons (nucleons). C. Has most of the mass. D. Has a fraction of the volume. |
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| A chart that lists elements by atomic # and electron arrangements. Similar chemical properties are in columns. |
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| 4th phase of matter, consists of (+) ions and free electrons. |
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| (+) charged particle in the nucleus of an atom. |
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| The mass of an atom is/is not mostly in the electrons. |
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Definition
| is not. The atom’s mass is almost entirely in its nucleus |
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| The nucleus has several components but the two main components are __________________________ and ________________ |
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| The number of _____ determines the element to which the atom belongs. |
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| An electrically neutral atom has ____________ outside the nucleus equal in the number to the ____________________ inside the nucleus. |
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| A high-energy electron beam has a wavelength ___________ than the wavelength of visible light. |
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