Question

8. Select the true statement. a. Atomic radius increases going from left to right across a period. b. The p electrons in fluorine are more poorly shielded from the nuclear charge than the p electrons in carbon. c. Cations are larger than their corresponding neutral atoms. d. Anions are smaller than their corresponding neutral atoms. e. Ionic radius generally decreases down a group. 9. (ACS question) Which of these elements has the highest first ionization energy? a. Ne b. F c. O d. Lie. Rb 10. For which of the following elements is gaining an electron the most energetically favorable (i.e., which has the most negative value of electron affinity)? a. b. Ar c. Fed. Cie. Si 11. Which of these compounds would be expected to have the greatest lattice energy? a. NaCl b. MgSc. Mgod. AIN . AIP 12. Use the octet rule to predict the number of bonds Si, P, Se, and Cl are likely to make in a molecule. a. four, five, six, seven, respectively b. three, three, two, two, respectively c. four, three, two, one, respectively d. four, one, one, one, respectively c. four, four, three, three, respectively 13. (ACS question) How many nonbonding pairs of electrons are on the central atom in IF,? a. 4 b. 3 c. 2 d. 1 e.0 14. Select the molecule or ion that has eight valence electrons. a. BCI b. CIO c. NO d. NHI e. None of the above 15. Draw the Lewis structure of nitrogen dioxide and select the correct description. a. N is the central atom; two single bonds, and one lone pairs. b. N is the central atom, one single bond, one double bond, and one lone pairs. c. N is the central atom; one double bonds, and one unpaired electron d. O is the central atom, one single bond, one double bond, and six lone pairs. e. O is the central atom; two single bonds, and eight lone pairs. 16. Which of these molecules is likely to be an exception to the octet rule? a. OCl2 b. PCI c. CF4 d. XeF. e. ICI

Answer 1

③ The p electrons in fluorine are more poorly shielded from the nuclear charge than the P electrons in Carbon (b) 9) Ne has stable electronic Contiguaration it has highest first ionisation energy 11) 19) Cl has Largest electron affinity AIN has greatest lattice energy Sí, p, serce four, three, two, one - bonds.