Please Help!!! Balance the following chemical equation by typing the coefficients in the drop-down boxes for the reactants and products. (Reactants are on the top line; products are on bottom line.)
[ Select ] NaBr + [ Select ] CaF2 --> [ Select ] NaF + [ Select ] CaBr2

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

mention the spill to the teacher clean the area and throw the broken pieces away

explanation:

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.