An element has the following successive ionization energies: I1 = 578 kJ/mol I2 = 1817 kJ/mol I3 = 2745 kJ/mol I4 = 11,577 kJ/mol I5 = 14,125 kJ/mol Based on these relative values, which ionization energies correspond to removing core (nonvalence) electrons?

11,577 kJ/mol

Explanation:

Let's see the difference between the ionization energies at each step of the electron removal.

kJ/mol

kJ/mol

kJ/mol

Here we see that the difference between fourth ionization energy and third ionization energy is much greater than the earlier differences of ionization energies. This means that the fourth electron the was ejected in the fourth step was the core electron. So indicates the removal of core electron.

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

i think it is true since you can test the answer and can use observations to complete it.