AP BIOLOGY

Detailed explanation-1: -In the Bohr model, there are a few guidelines that will help you draw accurate diagrams. Electronsmust occupy the lowest available shell, closest to the nucleus. The maximum number of electrons that can fill each shellis: two in the first shell, eight in the second shell, eight in the third shell.

Detailed explanation-2: -The first shell (closest to the nucleus) can hold two electrons. The second shell can hold 8 electrons. The third shell can hold 32 electrons. Within the shells, electrons are further grouped into subshells of four different types, identified as s, p, d, and f in order of increasing energy.

Detailed explanation-3: -This atom that has four electrons in the second energy shell is carbon.

Detailed explanation-4: -The second shell has two subshells (labeled 2s and 2p). The 2s subshell holds a maximum of 2 electrons, and the 2p subshell holds a maximum of 6 electrons. This means that the second shell can hold a maximum of eight electrons (2+6=8).

Detailed explanation-5: -What is the 2 8 8 18 rule in chemistry? Each shell can contain only a fixed number of electrons: the first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.