Question

1. use the periodic table to choose the best answer. —— would have an electron affinity higher than that of nitrogen. carbon oxygen 14. choose the best answers. atomic masses —— across a period and —— down the periodic table. decrease; decrease decrease; increase increase; increase increase; decrease

Explanation:

1. Nitrogen has a relatively low electron affinity due to its half - filled \(2p\) orbital (\(2p^3\)) which gives it extra stability. Oxygen, being to the right of nitrogen in the periodic table (same period), has a higher electron affinity. Carbon is to the left of nitrogen in the same period and has a lower electron affinity than oxygen.
2. As we move across a period (from left to right) in the periodic table, the atomic number increases. Since atomic mass is related to the number of protons and neutrons, and as we add more protons (and usually neutrons) across a period, atomic mass increases. As we move down a group (top to bottom), more electron shells are added, and the number of protons and neutrons also increases, so atomic mass increases down a group.

Answer:

1. B. Oxygen
2. C. increase; increase