Explain how you can use the lewis dot structure to determine whether the element selenium would form a cation or anion. what is the most common selenium ion?

Anion,

Explanation:

Lewis structures are the diagrams which represent valence electrons of the atoms.

The Lewis symbols help to visualize valence electrons of the atoms and also the number of ions gained or lost by the atom to complete their octet and get stable.

The electronic configuration of selenium is : 2,8,18,6

The Lewis representation of the atom is:

The valence electrons are 6 and it will gain 2 electrons to form corresponding anion.

Thus most common form of selenium ion is

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error