Question 3 An atom contains 24 electrons, 24 protons and 28 neutrons. What is the mass number of the atom? Question 4 The atomic number of the atom is 15? How many valence electrons are present in the atom? Question 5 The atomic number of the atom is 21? How many valence electrons are present in the atom?
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Step 1: Calculate the mass number of the atom by adding the number of protons and neutrons. Show more…
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