leonard designed a parell circuit To light two light bulbs. but his circuit doesn’t work. which two items in the circuit must be addressed for the lightbulbs to light as planned.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.