5.When moving ACROSS a period on the periodic table, atomic radius __ and ionization energy __ __ ! This is because the atom is gaining more __ in the nucleus, which means there is a __ attraction for electrons. 6. When moving DOWN a column on the periodic table, atomic radius __ and ionization energy __ __ This is because the atom is gaining more __ , which means there is a __ attraction for

## Step 1<br />When moving across a period on the periodic table, the atomic radius decreases. This is because as we move from left to right across a period, the number of protons in the nucleus increases. This increase in the number of protons leads to a stronger attraction between the nucleus and the electrons, pulling the electrons closer to the nucleus and thus decreasing the atomic radius.<br /><br />## Step 2<br />Simultaneously, the ionization energy increases as we move across a period. This is because the electrons are being pulled closer to the nucleus due to the increased number of protons, making it harder to remove an electron from the atom. Therefore, the ionization energy increases.<br /><br />## Step 3<br />When moving down a group on the periodic table, the atomic radius increases. This is because as we move down a group, the number of electron shells increases. This means that the electrons are located further from the nucleus, leading to an increase in the atomic radius.<br /><br />## Step 4<br />Simultaneously, the ionization energy decreases as we move down a group. This is because the electrons are located further from the nucleus due to the increase in the number of electron shells, making it easier to remove an electron from the atom. Therefore, the ionization energy decreases.