Problem 24
Which noble gas is isoelectronic with each of the following nonmetal ions? (a) \(\mathrm{Br}^{-}\) (b) \(\mathrm{O}^{2-}\) (c) \(\mathrm{Se}^{2-}\) (d) \(\mathrm{N}^{3-}\)
Problem 26
In each of the following pairs, which has the larger radius? (a) Al atom or Al ion (b) \(\mathrm{Pb}\) atom or \(\mathrm{Pb}\) ion (c) Se atom or Se ion (d) \(\mathrm{N}\) atom or \(\mathrm{N}\) ion
Problem 27
Which of the following statements are true regarding an ionic bond between cobalt and sulfur in a CoS formula unit? (a) Cobalt and sulfide ions bond by electrostatic attraction. (b) Cobalt atoms gain electrons and sulfur atoms lose electrons. (c) The ionic radius of a cobalt ion is greater than its atomic radius. (d) Breaking an ionic bond between cobalt and sulfur requires energy.
Problem 28
Which of the following statements are true regarding an ionic bond between aluminum and nitrogen in an AlN formula unit? (a) Aluminum and nitride ions bond by covalent attraction. (b) Aluminum atoms lose electrons and nitrogen atoms gain electrons. (c) The ionic radius of an aluminum ion is less than its atomic radius. (d) Breaking an ionic bond between aluminum and nitrogen releases energy.
Problem 30
Which of the following is less? (a) the sum of the \(\mathrm{H}\) and \(\mathrm{Br}\) atomic radii, or the bond length in \(\mathrm{H}-\mathrm{Br}\) (b) the sum of the \(S\) and \(O\) atomic radii, or the bond length in \(S=O\)
Problem 31
Which of the following statements are true regarding a covalent bond between nitrogen and oxygen atoms in a nitric oxide, NO, molecule? (a) Valence electrons are shared between nitrogen and oxygen atoms. (b) Bonding electrons are found only between the bonded atoms. (c) The bond length is greater than the sum of the two atomic radii. (d) Energy is required to break a covalent bond.
Problem 32
Which of the following statements are true regarding a covalent bond between carbon and oxygen atoms in a carbon monoxide, \(\mathrm{CO},\) molecule? (a) Valence electrons are transferred from carbon to oxygen atoms. (b) Bonding electrons are distributed over the entire \(\mathrm{CO}\) molecule. (c) The bond length is less than the sum of the two atomic radii. (d) Energy is released when a covalent bond is broken.
Problem 33
Write the electron dot formula and draw the structural formula for each of the following molecules. (The central atom is indicated in bold.) (a) \(\mathrm{H}_{2}\) (b) \(F_{2}\) (c) HBr (d) \(\mathbf{N H}_{3}\)
Problem 35
Write the electron dot formula and draw the structural formula for each of the following molecules: (a) HONO (b) SO \(_{2}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{2}\)
Problem 37
Write the electron dot formula and draw the structural formula for each of the following molecules: (a) \(\mathrm{CH}_{4}\) (b) \(\mathrm{OF}_{2}\) (c) \(\mathrm{H}_{2} \mathrm{O}_{2}\) (d) \(\mathrm{NF}_{3}\)
