Which of the following processes will determine the number of atoms in a sample? dividing the mass of the sample by its molar massmultiplying the mass of the sample by its molar massdividing the number of moles of the sample by avogadro's numbermultiplying the number of moles of the sample by avagadro's numberall i know is it is not a.

D  Multiplying the number of moles of the sample by Avogadro's number

Explanation:

this question ask about the NUMBER OF ATOM in a sample

To calculate the number of atoms in a sample, find the molar mass of the substance, weigh the sample, divide the measured weight by the molar mass, then multiply by Avogadro's number.

so the answer is D.

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.