Divers often inflate heavy duty balloons attached to salvage items on the sea floor. If a balloon is filled to a volume of 14.9 L at a pressure of 3.11 atm, what is the volume of the balloon when it reaches the surface where the atmospheric pressure is 1 atm? Use L as the unit and keep correct number of significant figures.

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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.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

4d^55s^1 ( third choice)