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1 erage WORKSHEET 3 Atoms and elements Core curriculum 1 Complete the statements a = f below by writing the letter 8, d, m, or fin each box Key a= the same number of m= more d= adifferent numberof f = fewer a Twoatoms of the same element have S protons, and] & | electrons. b Compared to its atom, a positive fon has |] protons, and 2 electrons. ¢ Compared to its atom, a negative ion has E protons, and|Y\| electrons, d Two isotopes of the same element have S Protons, and é neutrons. ¢ Allatoms of uranium-235 have |G neutrons, and| S| electrons. f Compared to atoms of elements in Period 3, atoms of elements in Period 2 have + protons and £ electrons. 2. This table is about isotopes of some common elements, Complete it. isotope name of element | proton number | nucleon number number of poe 8 fo oxygen 8 16 8 8 8 Yo | oxygen 3 1% B & lo Be | corloon G \r b 6 & ve | Covloon ( \3 4, © Hime | Magnesilys (4. Le iL It I(t Hime | Yaogeesium (4 Ls IL AL 13, O CMloirr Wy 4S 17 17. 8 Ci CMlorine \N 4% 7 17. 20 ) © OUP: this may be reproduced for class use solely for the purchaser's institute 
