The first three steps in the formation of the sun are listed below. a cloud of gas and dust called nebula spins slowly. the nebula collapses due to condensation of gases. the cloud spins faster as it collapses. which of these statements best describes the next step in the formation of the sun? the contracting nebula flattens into a disk with a bulge at the center. the gas particles in the nebula repel each other and move apart. the nuclear fission of the gas molecules releases large amount of energy. the sun is created at the outermost portion of the condensed nebula.

The contracting nebula flattens into a disk with a bulge at the center.

Explanation:

Sun was formed in solar nebula about 4.5 billion years ago. Solar nebula is a molecular cloud of dust and gases which slowly spun and collapsed due to condensation of gases.  The cloud started spinning faster and collapsed. Thereafter, the contracted nebula flattened into a disk and bulge at the center was formed. The temperature and pressure rose till the nuclear fusion reaction started releasing huge amount of energy. The sun was born. The rest of the matter accreted to form planets.

i had this on my unit activity, i can you if you are a plato student. are you a plato student?

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.