What main criterion determines major divisions in the geologic time scale?(1 point)

shifts in the position of Earth in its orbit

different stages in human evolution

the occurrence of huge events in Earth's natural history

times of major climate change

false

because it does not have the potential to be entirely used up

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.  

it is stable as it is in group 0 which have full outer shells of electrons