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6. All atoms have a central nucleus.Why is the nucleus is positively charged

  • because atom contain positive ions only
  • because it is made up of protons which are positively charged and neutrons which are neutral
  • because the nucleus contain only positive electrons

7. why are some atoms of a particular element called isotopes

  • different types of atoms
  • some elements have varieties that have different numbers of neutrons
  • have unusual chemical bond

8. why does atoms have no charge

  • because the contain a nucleus
  • because it has the same number of protons and electrons, so they cancel out each other’s charge.
  • because everything is negative

9. what is Covalent bonding

  • Two atoms share a pair of electrons.
  • when atoms convert to molecules
  • when an atom gain an extra shell