Alice went camping with her family. She set up her tent in a grassy area. After two weeks, she noticed that the grass under her tent turned brown. Which factor most likely explains why the grass turned brown? lack of water and sunlight

lack of oxygen and fertilizer

lack of soil and shade

lack of food and nutrients

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.