A solution of Al(NO₃)₃ is 2.00 molarity. What volume of this solution contains 0.250 moles of NO₃₋ ions?

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.  

its first and third is your answer i did the qustion the fourth isnt right

hurricanes form in warm water

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.