1) The simplest unit of an element is a(n) a) atom b) molecule c) proton 2) An amount of an element equal to its atomic mass in grams is a) one atom of the element b) one mole of the element c) one molecule of the element 3) A substance containing atoms of more than one element in a definite ratio is called a(n) a) compound b) element c) mixture 4) When several atoms are so tightly bonded together that they physically behave as a unit, the unit is called a(n) a) atom b) mixture c) molecule 5) The simplest unit of a compound is a(n) a) atom b) proton c) molecule 6) The composition of a compound is shown in its a) chemical name b) chemical formula c) color 7) The chemical formula for magnesium sulfate is MgSO 4. This formula tells us that a) there is one atom of Mg, one atom of sulfur, and four atoms of oxygen b) there are four atoms of Mg, four atoms of sulfur, and four atoms of oxygen c) there is one atom of Mg, four atoms of sulfur, and four atoms of oxygen 8) Two atoms of Na, one atom of S, and four atoms of O will have the chemical formula of a) NaSO b) Na2(SO4)4 c) Na2SO4

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