Which of the following statements about ionization energy is true? a. ionization energy is the amount of energy used to add an electron to an atom. b. elements toward the bottom of a group periodic table generally have higher ionization energies than elements at the top of the group. c. in a period, elements farther to the right generally have lower ionization energies than elements on the left. d. potassium has a lower ionization energy than sodium.

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.  

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.