When asked to compare the size of an atom, you should pay the most attention to ? A. The atomic mass of each atom involved
B. The atomic radius trend
C. The electronegativity trend
D. The ionization trend

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.