How does concentration affect the rate of reaction?

It's like rugby 7s and 15s

Rugby 7s has only 7 players from each each team playing, so the game is mostly centered about dodging with the ball and there is a lesser chance of getting tackled. Rugby 15s on the other hand, has the same field, but more people in the field, instead of 7, it's 15 from each side. Now there is a high possibility of getting tackled if you have the ball.

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.