What is the formula for a mass number of an atom?
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Which of the following is responsible for the mass of an atom?
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Which of the following determines the chemical properties?
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An atom has mass number 37 and atomic number 17. Find the number of protons
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Nickel has atomic number 28. Choose the correct electronic configuration for Nickel
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A neutral atom of an element has 2 electrons in the first energy level, 8 in the second energy level and 8 in the third energy level. This information does not necessarily tell us
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How many p electrons are there in an atom of rubidium?
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Which one of the following sets of quantum numbers could be those of the distinguishing (last) electron of Mo?
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In the ground state of a cobalt atom there are _____ unpaired electrons and the atom is _____.
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The outer electronic configuration ns2np4 corresponds to which one of the following elements in its ground state?
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