When changing theories, everything about the old theory is discarded and a completely new theory is written. True False Question 2 3.33 pts Dalton's atomic theory is the currently accepted theory of the atom. True False Question 3 3.33 pts In the currently accepted atomic theory, the protons and neutrons are in the nucleus and account for most of the mass of the atom. True False
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False. When changing theories, not everything about the old theory is discarded. Often, new theories build upon or modify existing theories, rather than completely replacing them. Show more…
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In 1808, John Dalton wrote his atomic theory of matter. The following is a list of points from that theory. If it is still considered true today, label it true. If it is not considered true today, label it false. 1) Atoms cannot be subdivided. 2) Atoms cannot be created or destroyed in a chemical reaction. 3) All atoms of a given element are identical in size, mass, and other properties. 4) All matter is composed of extremely small particles called atoms. 5) Atoms of different elements combine in whole number ratios to make compounds. 6) In chemical reactions, atoms are combined, separated, or rearranged.
Adi S.
1. Which of the following statements is one of the conclusions reached by Ernest Rutherford from his well-known experiment with thin sheets of gold? A. The atom is made up of electrons, protons, and neutrons. B. The charge of the electron is -1 and that of the proton +1. C. Electrons travel in orbits around the nucleus, and each orbit represents a quantized energy level. D. Neutrons give stability to the nucleus by counteracting repulsion between protons. E. Most of the atom is empty space and its mass is concentrated in a small volume. 2. Which or which of the original statements of Dalton's theory is (are) not entirely correct? A. All matter is made up of atoms. B. Atoms of one element cannot be converted to atoms of another element C. The atoms of an element are all identical in both mass and properties, and are different from atoms of other elements. D. Compounds are formed by chemically combining atoms of different elements in fixed proportions. E. Statements B and C.
Shaiju T.
Determine whether each statement that follows is true or false. a) Dalton proposed that atoms of different elements always combine on a one-to-one basis. b) According to Dalton, all oxygen atoms have the same diameter. c) The mass of an electron is about the same as the mass of a proton. d) There are subatomic particles in addition to the electron, proton, and neutron. e) The mass of an atom is uniformly distributed throughout the atom. f) Most of the particles fired into the gold foil in the Rutherford experiment were not deflected. g) The masses of the proton and electron are equal but opposite in sign. h) Isotopes of an element have different electrical charges. i) The atomic number of an element is the number of particles in the nucleus of an atom of that element. j) An oxygen-16 atom has the same number of protons as an oxygen-17 atom. k) The nuclei of nitrogen atoms have a different number of pro- I) Neutral atoms of sulfur have a different number of electrons from neutral atoms of any other element. m) Isotopes of different elements that exhibit the same mass number exhibit similar chemical behavior. n) The mass number of a carbon- 12 atom is exactly $12 \mathrm{g}$. o) Periods are arranged vertically in the periodic table. p) The atomic mass of the second element in the farthest right column of the periodic table is 10 amu. q) Nb is the symbol of the element for which $Z=41$. r) Elements in the same column of the periodic table have similar properties. s) The element for which $Z=38$ is in both Group $2 A / 2$ and the fifth period.
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