Elements and compounds 2

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  • Mum, what can you tell me about the periodic table?
  • Its a method of arranging all the elements in groups and periods and was invented by Dmitri Mendeleev. It start off with the smallest atom, hydrogen and the size of the atom keeps increasing. You've learnt about atoms, right?
  • Yes. They're made of protons, neutrons and electrons.
  • Yes, well, all the atoms in one group have the same number of electrons in their outermost shell. This is called their valency. As you move leftward and lower in the table, the atoms become bigger.
  • Shreya mentioned it and I was curious. I've finished all me homework. Do you mind if I watch TV?
  • Anyway, why the sudden interest?
  • Thanks
  • Sure, go ahead.
  • Countries still argue about the risks posed by nuclear energy. While it produces a lot of electricity, is it really worth the risk? Its effect are terrible and last centuries......
  • What's nuclear energy? are any elements nuclear?
  • Nuclear energy is the energy in the nucleus of an atom. Some radio active elements can be used to produce it.
  • Okay, sure!
  • I'd better find out a bit about all this before she can ask more questions! I never realised how much Chemistry Id forgotten.
  • Okay, thats enough of being inside. Go out and play.
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