Please help!!! A silver ring reacts with compounds containing sulfur in the air to form silver sulfide,

a black substance that makes up the tarnish on the surface of silver objects. To

remove the tarnish from the ring, students placed it in a pan lined with aluminum foil

and added hot water. Baking soda was added to the hot water and stirred. Students

made observations about the process.

Which observation of this process provides evidence of a chemical reaction?

"a connection, a bond or common feeling between two people", or as a chemical process it stimulates love or sexual attraction

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.