Unit-5 Chemical Bonding
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Unit-5 Chemical Bonding
Answer: Bonds form either by transfer of electrons (ionic) or by sharing of electrons (covalent).
Answer: Oppositely charged ions attract each other through electrostatic forces.
Answer: Hydrogen is stable with two electrons, just like the noble gas helium.
Answer: Oxygen attracts the shared electrons more strongly than hydrogen.
Answer: The N identical to N triple bond is made of one sigma and two pi bonds.
Answer: Dots in a Lewis structure stand for the valence electrons of an atom.
Answer: The Mg2+ ion needs two Cl- ions to neutralize its charge, giving MgCl2.
Answer: Nitrogen (2,5) has five electrons in its outermost shell.
Answer: Metals transfer electrons to non-metals to form oppositely charged ions.
Answer: Metal cations are surrounded by a mobile sea of delocalized electrons.
Answer: Non-metals share electrons with one another to form covalent bonds.
Answer: Oxygen (2,6) has six valence electrons and requires two more to complete its octet.
Answer: NH4+ has one dative bond in addition to its three covalent bonds.
Answer: The donor atom provides the full shared pair of electrons for the bond.
Answer: Unequal sharing gives the more electronegative atom a partial negative charge and the other a partial positive charge.
Answer: One pair of shared electrons forms a single bond.
Answer: Three shared pairs mean six shared electrons in a triple bond.
Answer: Magnesium (2,8,2) has two electrons in its outermost shell.
Answer: Hydrogen and oxygen are non-metals that share electrons to form a covalent compound.
Answer: Melting NaCl requires overcoming the strong electrostatic forces of the ionic lattice.