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PS Ch 4-5 Terms

Name:  _______________________________
Date:__________________Pd:____________
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Across
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An atom of an element that has the same number of protons but a different number of neutrons relative to other atoms of the same element
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An element that conducts heat and electricity poorly, example: oxygen, chlorine, argon
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The max number of electrons the third orbital can hold
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Semiconductors, found in Groups 13-17, have characteristics of both metals and nonmetals, includes Tellurium
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A unit or quantum of light
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The scientist who said atoms of a given element were exactly alike, and atoms of different elements could combine to form compounds
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The positively charged central part of the nucleus
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Isotopes that emit radiation and decay into other isotopes
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The SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12g of C-12
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The max number of electrons the second orbital can hold
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6.022 x 10^23 particles
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Elements of Group 17, most reactive of the groups, have seven valence electrons
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The scientist who conducted the cathode-ray tube experiment, discovered electrons, and developed the plum-pudding model
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Metals found in Groups 3-12, includes gold and silver
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The scientist who first identified the possibility of the atom
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Scientist who created the foundations for the periodic table
Down
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A region in an atom where there is a high probability of finding electrons
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Elements found in Group 18, nonreactive, often used in light making
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A subatomic particle that has a negative charge and is found in the orbitals
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A subatomic particle that has no charge and is located in the atom's nucleus
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Metals found in group 2. They are harder, denser, and stronger than the Alkali metals
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A positively charged particle in the nucleus of an atom
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Electrons found in the outer shell, all elements of the same period have the same number
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The max number of electrons the first orbital can hold
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The number of protons in the nucleus of an atom
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The max number of electrons the fourth orbital can hold
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The scientist who proposed that most of the mass of the atom was concentrated at the atom's center, conducted the gold-foil experiment
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Metals found in Group 1, soft and shiny, react violently with water
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The sum of the numbers of protons and neutrons in the nucleus of an atom, the rounded mass
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An element that is shiny and conducts heat and electricity well, commonly found on the left side of the periodic table