51 What is the total number of electron pairs shared between the carbon atom and one of the oxygen atoms in a carbon dioxide molecule? [ 1]HIGHLIGHT TO SEE THE ANSWER Answer =2 pairs O=C=O (4 electrons but the question wanted "pairs") |
52 Explain, in terms of subatomic particles, why the radius of a chloride ion is larger than the radius of a chlorine atom. [1] HIGHLIGHT TO SEE THE ANSWER NOTE= Subatomic particles are protons neutrons and electrons (use it) A Cl − ion has 18 electrons and 17 protons, so there is less attraction by the nucleus for the electron shells, allowing the electron shells to expand.The radius of Cl − is larger because the nucleus can’t hold 18 electrons as close as it can hold 17 electrons.The ratio of electrons to protons is greater in the ion than the atom, so the ion is larger. |
53 Explain, in terms of valence electrons, why the bonding in magnesium oxide, MgO, is similar to the bonding in barium chloride, BaCl2. [1] HIGHLIGHT TO SEE THE ANSWER WRONG ANSWER=Ionic (in terms of valence electrons) The bonding in each compound involves a transfer of valence electrons from the metal to the nonmetal. Both metals lose all of their valence electrons. |
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