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Atomic Structure Worksheet Refer to your periodic table to fill in the table. Name: ____________________________________ The periodic table can give you a great deal of information about the composition of an atom. • The atomic number is equal to the number of protons. • The atomic mass is equal to the number of protons plus neutrons. • In a neutral atom, the number of protons is equal to the number of electrons. • When an atom is in a charged state (ion) the charge indicates the imbalance between protons and electrons. • Too many electrons and the charge is negative. • Too few electrons and the charge is positive. EXAMPLE O-2 Explanation: Mass # = 16 Protons = atomic # Atomic # = 8 Neutrons=atomic mass –atomic # 8 protons, 8 neutrons, 10 electrons (8+2) Electrons = charge (+/-) proton # Complete the following chart. Element/ion Atomic # Mass # Li Ba+2 Al+3 F-1 Br Ru+3 Cr+2 S-2 Si C P+3 Ca+2 C Fe Na+1 7 137 27 19 80 101 52 32 28 12 31 40 14 56 23 # of protons # of neutrons # of electrons Element/ion Atomic # Mass # Pb Mg+2 Hg Ag N-3 P H+1 H-1 H Cu Mn Be+2 Br-1 Au U 210 24 201 108 14 33 1 1 3 64 55 10 80 197 240 # of protons #of neutrons # of electrons Try to name the atoms listed above (30): When you are given an ion how do you figure out how many electrons it has? Explain your method of figuring this out. What is an isotope? How do you know an atom is an isotope? Which atoms from the table are isotopes?