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Oxygen has 8 protons, 8 neutrons, and 8 electrons. What is its atomic mass?
(a) 8 (b) 16 (c) 24 (d) 32.
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- The atomic mass number of an atom is determined by the sum of the number of in the atom. (a) protons plus electrons plus neutrons (b) protons plus electrons (c) neutrons plus electrons (d) neutrons plus protonsThe atomic number of an atom is determined by the number of in the atom. (a) protons (b) neutrons (c) electrons (d) electrons plus neutrons plus protons. Give the name of and symbol for an element with this number of valence electrons.a) 2b) 6c) 8
- Which statement is true of all atoms that are anions?(A) The atom has more electrons than protons.(B) The atom has more protons than electrons.(C) The atom has fewer protons than does a neutral atomof the same element.(D) The atom has more neutrons than protons.a) Identify the following as element (atomic or molecular), compound or mixture. b) Explain your reasoning and draw a sample of these substances containing 5 particles of that particular material. c) What would be the mass of 5 particles of that particular material? Show your work! H20 N2 C2HSOH Iodine gasUse your copy of the periodic table to answer this question: If you add an electron to fluorine, what will result? A) a negatively charged anion B) a different atomic number C) a different isotope D) a different element E) a positively charged cation
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- The atomic mass of an element can be used to determine A) the chemical properties of the element B) the number of protons in the element C) the number of neutrons in the element D) the number of protons plus neutrons in the element E) both the number of protons and the chemical properties of the element11H and 13H have (a) different chemical properties because they have different atomic numbers (b) the same chemical properties because they have the same number of valence electrons (c) different chemical properties because they differ in their number of protons and electrons (d) the samechemical properties because they have the same atomic mass (e) the same chemical properties because they have the same number of protons, electrons, and neutronsArrange in order of increasing atomic size. (a) the period 2 elements Li, C, and F (b) the group 4A elements Sn, Ge, and Si