What do you wrap your sandwich in? (pun, answer must be from the periodic table)

Aluminium foil

Explanation:

The best element to wrap food in is an aluminium foil.

The metal is a silvery metal that is found in the Group 3A elements of the periodic table.

It has a symbol, A.

The atomic mass is 26. 981539 atomic mass units or simply ,u.

The electronic number of the metal is 13, this means that it has 13 electrons in its outer shell.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa