Physics

Physics, 01.08.2019 23:00, chloesmolinski0909

An element is a substance composed of atoms that all have the same number of protons. a. true b. false

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Chemistry, 28.07.2019 11:30, kamilagreyes9

1.the protons in the nucleus attract electrons. true false 2.neutrons have a positive charge. true false 3.scientists have discovered over two hundred elements. true false 4.an element is composed of at least two kinds of atoms. true false

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Chemistry, 25.08.2019 07:30, hailiemanuel930

Which statement is not part of dalton's atomic theory? a) each element is composed of indestructible particles called atoms. b) atoms are themselves composed of protons, neutrons, and electrons. c) all atoms of a given element have the same mass and other properties. d) atoms combine in simple whole-number ratios to form compounds.

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Chemistry, 19.09.2019 16:20, vorhees2406

25. which one of the following is not one of the postulates of dalton's atomic theory? a) atoms are composed of protons, neutrons, and electrons. b) all atoms of a given element are identical; the atoms of different elements are different and have different properties. c) atoms of an element are not changed into different types of atoms by chemical reactions: atoms are neither created nor destroyed in chemical reactions. d) compounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms. e) each element is composed of extremely small particles called atoms.

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