2. Cell Chemistry & Cell Components

An oxygen atom has eight protons.

(b) How many more electrons will it take to fill the outermost energy level?

How many electrons does an Oxygen atom need to fulfill the octet rule by filling its valence shell?

An oxygen atom has eight protons.

(a) Sketch in the arrangement of electrons around the nucleus of the oxygen atom in the following diagram.

An atom of the element calcium has 20 protons and 20 neutrons. Determine the following information about calcium:

(a) Number of electrons

(b) Atomic number

(c) Atomic weight

(d) Number of electrons in each energy level

Which of the following is true about electron energy shells?