The density of water at 25°C is 0.997 g/cm3. The density of ice is 0.917 g/cm3. If a 250 mL bottle is filled completely with water at 25°C and this amount of water is frozen, what volume will the solid ice occupy?

m=9

step-by-step 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.  

2b2t

explanation:

2b2t

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a