Solutions to p 14 and 15

1.         Complete the following table.

 Name Isotope Notation Atomic Number Mass Number Number of Protons Number of Neutrons Number of Electrons Neutral carbon C 6 14 6 8 6 Neutral oxygen O 8 15 8 7 8 Phosphide P-3 15 31 15 16 18 Boron 5 9 5 4 2 Selenide 34 79 34 45 36 Californium 251Cf +2 98 251 98 153 96 Fluoride 19F -1 9 19 9 10 10 Potassium K+1 19 49 19 30 18 Magnesium Mg+2 12 25 12 13 10 Krypton Kr 36 77 36 41 36 Hydride H-1 1 3 1 2 2 Hydride H-1 1 2 1 1 2 Iodide I-1 53 127 53 74 54 Potassium K+1 19 40 19 21 18 Praseodymide Pr-1 59 140 59 81 60 Sodium Na+1 11 23 11 12 10 Magnesium Mg+2 12 24 12 12 10 Aluminum Al+3 13 27 13 14 10 Boron B+3 5 11 5 6 2 Chloride Cl-1 17 35 17 18 18 fluoride F-1 9 19 9 10 10 Calcium ion (+2) Ca+2 20 40 20 20 18

2.         Answer the following “who am I?” questions with one of the following terms:

proton, neutron, electron, or ion.

a.                I am a positively charged particle found within the nucleus______proton_______

b.               I am the least heavy of the subatomic particles________electron______

c.                If magnesium loses electrons, I turn into one of these____ion_____

d.               Compared to carbon 13, carbon 14 has one more of these ____neutron______

e.                If an atom loses one of these it becomes positively charged_____electron______

3.         If it was possible to add 2 protons to a neutral neon atom (mass number : 20), what would you end up with? Show the full isotope notation of the newly created atom and all work needed to arrive at your answer.

 original new Ne 10 protons 10 neutrons (=20 -10) 10 electrons( = protons since it was neutral) 22Mg+2 ( charge = p-e) 10+2 =12 protons 10 neutrons 10 electrons

4.         Show through example how the chemical properties of an ion differ from those of its neutral counterpart.

H+ found in acid will react with skin

H2 will not react with skin