A chemical equation is balanced if the number of each type of atom on the left side is equal to the number of each type on the right side. Is this reaction balanced?

See explanation below

Explanation:

You are not putting the equation to balance. I found a question which is pretty the same as this one and put the following reaction:

H₂ + O₂ > H₂O

If you have a different equation please post again the question.

According to the above reaction, we can say that it's not balanced.

The reason is because in the reactants we have 2 atoms of hydrogen and oxygen, but in the products, we only have 1 atom of oxygen. so both sides do not have the same number of atoms.

To balance, we need to put a number in the product or reactant as coefficient in order to balance the whole reaction. In this case, as Oxygen is unbalanced, I will put a 2 in the products to balance the oxygen:

H₂ + O₂ > 2H₂O

But putting this 2 will unbalance the hydrogen in the products. We now have 4 atoms of hydrogen. What should we do now?, yes, we put a 2 in the reactants to balance the hydrogen, and then, the whole equation is balanced.

2H₂ + O₂ > 2H₂O

Hope this helps

b. No, because there are two oxygen atoms on the reactants side of the equation, and only one on the products side of the equation.

Explanation:

Hello,

In this case, given the reaction:

Considering the law of mass action which demands us to equal the number of atoms at each side of the chemical equation, we notice that there are two hydrogen atoms at both the left side and right side, so it is balanced. Nevertheless, we notice oxygen is not balanced since two oxygen atoms are at the left side and only one at the right side, so the option is b. No, because there are two oxygen atoms on the reactants side of the equation, and only one on the products side of the equation.

Regards.

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.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.