An object is placed in a graduated cylinder containing 15 mL of water, and the water rises to 30 mL. If the mass of the object is 54 g, what is the density of the object?

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

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.  

the answer is true. hope it .