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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