I'LL GIVE AGAIN <3 8. What is the density of an 84.7 g sample of an unknown substance if the sample occupies 49.6 cm^3? * 17.1 g/cm^3 1.71 g/cm^3 1.70766129 g/cm^3 4,201 g/cm^3

B) One way of solving this is to use dimensional analysis and cancel out grams to find volume.

A) density over mass is volume. Mass is 84.7 g and volume is 49.6 cm cubed

Explanation:

i believe the answer is a.

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.