•2.24: Write the symbol for an isotope
•that contains 92 protons and 146 neutrons
•
•2.30: Which are true?
•An atom with an atomic number of 7 and a mass number of 14 is identical to an atom with an atomic number of 6 and a mass number of 14.
•Neutral atoms have the same number of electrons as protons.
•The mass of an atom is due to the sum of the no. of protons, neutrons and electrons.