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Atomic structure

Atomic structure. Negative charge, mass almost nothing. Neutral charge, same mass as proton (“1”). Positive charge, same mass as neutron (“1”). The Periodic Table. It contains all the elements we know about. It does NOT contain compounds or mixtures.

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Atomic structure

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  1. Atomic structure Negative charge, mass almost nothing Neutral charge, same mass as proton (“1”) Positive charge, same mass as neutron (“1”)

  2. The Periodic Table • It contains all the elements we know about. • It does NOT contain compounds or mixtures. • Each box contains a different element, the atoms are different in each case.

  3. Counting Atoms • How many atoms of each element are in the following molecules? 1. H2SO4 2. Ca(OH)2 3. NaCl 4. (NH3)3P04 5. 3H2O 6. 4Al2(CO3)3

  4. Then all you do is list the atoms that are involved on each side of the arrow Mg + O2 MgO Firstly you need an equation with the correct “formulae” in………. You’ll probably be given this in the question Just like this one Mg + O2 MgO Mg O

  5. Mg + O2 MgO Mg + O2 MgO Mg O Mg O 1 1 2 1 Then start balancing: [1] Just count up the atoms on each side 1 1 2 1 [2] The numbers aren’t balanced so then add “BIG” numbers to make up for any shortages 2 2 2 And adjust totals

  6. 2 2 1 Mg + O2 MgO 2 2 Mg O But the numbers still aren’t equal, so add another “BIG” number 2 2 And adjust totals again NOW BOTH SIDES HAVE EQUAL NUMBERS OF ATOMS WE SAY THAT THE EQUATION IS BALANCED!!

  7. Balancing Equations • Try the examples!

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