Carboxyhemoglobin may be formed when a person inhales air that contains a. carbon dioxide b. carbon c. carbon monoxide d. sulfur dioxide e. none of the above

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

a electronegativity decreases beacuse the size of nucleus is bigger.