2. Which of the following is the reason that ionization energy generally increases from left to right across the first period of the periodic table? (A) As the atomic number increases, the electrons are harder to remove.

(B) Ionization energy increases as the atomic number increases in a period.

(C) As the atomic number increases, more electrons are
added to the atoms, thus increasing the electron-electron repulsions.

(D) As the atomic number increases, more protons in the
nucleus cause an increase in the effective nuclear charge,
making it harder to remove the electrons.

Coal i believe hope this

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  c.sending the first human into space4. which of these space missions involved the deployment of lunar roversa. voyager 15. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar  systemb.safir7.which technology limit the future of space explorationb. scientist must first develop certain technologies before missions can be completed.