For the most part, Group 16 forms -2 ions, therefore they most readily bond with Group 2, which primarily form +2 ions.
Many elements do, the the most reactive ones are the metals on the left column of the Periodic Table: Lithium, Sodium, Potassium, etc. (they react almost explosively with chlorine).
The reactivity of halogens decreases down the group, which means Fluorine is the most reactive halogens as it is the most electronegative elements among the halogens, and also the Periodic Table.
Vinegar is a solution of a carboxylic acid (acetic acid) which means that most metal compounds (particulaly alkaline metal compounds found in group 1 in the periodic table) will react with it to produce salts, carbon dioxide and water. Sodium Carbonate is a common example of a alkaline metal compound that reacts readily with vinegar.
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iron
The family of elements that react readily with metals is the halogens. This group includes elements such as fluorine, chlorine, bromine, iodine, and astatine. Halogens are highly reactive nonmetals that readily form compounds with metals by gaining an electron to achieve a stable electron configuration.
K potassium reacts readily with Cl chlorine because the electron configuration changes to that of a noble gas. Group 7a would be the best guess.
The alkali metals, group 1 of the periodic table, react more and more with O2 as you descend the group. From Na down to Cs, the metals are stored in oil so that they don't form an oxide layer. If you watch videos on Youtube about these metals, you'll see the oxide layer actually form before your eyes.
Most readily hydroxide ions (OH-) from water. Also, halogens react very readily (1:1 ratio). They are also readily oxidised. See the related video for reactions with water and oxygen
Fluorine does not attract metal, but it will react readily with most metals.
1
Group-17 in the periodic table gains electron most readily. The elements in this group require only one electron to complete its octet.
Group VII A or XVII or Halogens.
This is the valence electron.
Bi
elements of group 17 (most readily) followed by group 16 and group 15
Calcite