The lewis dot model of an atom has three dots. which of the following statements is true about the atom?

it has three valence electrons.
it has three innermost shell electrons.
it has three energy levels.
it has three subshells.

The answer to your question is It has three valence electrons.

Explanation:

It has three valence electrons.  The Lewis dot model considers only the valence electrons to represent the electrons that interact with another molecule, so it a model has three dots these dots are the valence electrons.

It has three innermost shell electrons.  Innermost shell electrons are not considered in the Lewis dot model, if it would consider them, these must be only 2, not three.

It has three energy levels.  Elements that are located in group 3 have three valence electrons, elements that have three energy levels are located in period three and not all of them have three valence electrons.

It has three subshells. This option is incorrect.

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

can you list the answers so i can answer