| 21. | With 20 valence electrons, nickelocene has the highest electron count of the transition metal metallocenes.
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| 22. | With only three valence electrons per boron atom, simple covalent bonding cannot fulfil the octet rule.
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| 23. | During most molecular bonding, it is the valence electrons which principally take part in the bonding.
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| 24. | This form of iron is very stable structurally because it's valence electron shell is half filled.
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| 25. | In ionic compounds, beryllium loses its two valence electrons to form the cation, Be 2 +.
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| 26. | A thorium atom has 90 protons and therefore 90 electrons, of which four are valence electrons.
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| 27. | The noble gases have full valence electron shells.
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| 28. | The typical elemental semiconductors are silicon and germanium, each atom of which has four valence electrons.
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| 29. | Acceptor impurity atoms have fewer valence electrons than the atoms they replace in the intrinsic semiconductor lattice.
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| 30. | So which one is the valence electrons?
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