Which of the following correctly explains how the atomic radius of atoms trend on the periodic table?
Choose ALL correct answers.
A. The atomic radius of fluorine (F) is smaller than beryllium (Be). Fluorine's 9 protons and 9 electrons will have a greater attraction than beryllium's 4 protons and 4 electrons.
B. The atomic radius of elements in the 5th period will be larger than elements in the 2nd period.
C. The atomic radius decreases from the bottom of a group to the top, because the number of energy levels decrease.
D. The atomic radius increases from left to right across periods, because the affinity of the nucleus and valence electrons of atoms also increase from left to right.
