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Sunday, November 22, 2009

1.All of them,except the hydrogen atom,have protons,neutrons and electrons.2.At the other end of the size scale is hafnium with 115 electrons,115 protons and 155 neutrons.
3.There are 115 known elements.Each made up of a different type of atom.4. The hydrogen atom without neutrons and consists of only one proton and one electron.5.The differences in atoms are due to differences in the number of sub-atomic particles found in them.6.Somewhere in the middle there is.For instance,iodine with 53 electrons ,53 protons and 74 neutrons.

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