The lewis dot model of an atom has seven dots. which of the following is true about the atom?
it has seven energy levels.
it has one valence shell electron.
it requires one electron to complete its octet.
it requires seven other atoms to form a stable compound.

It requires one electron to complete its octet.

It requires one electron to complete its octet.

Explanation:

Lewis-dot model shows the valence  electrons present in the atom by the help of dots.

Valency of an element is defined as the electrons gained or lost in order to attain stable electronic configuration.

Thus an atom with 7 valence electrons must be an element of group 17 or halogens and will all gain 1 electron to attain stable noble gas configuration or complete its octet.