Describe the orbital diagram of an atom with 16 electrons

 1s² 2s² 2p⁶  3s² 3p⁴

Explanation:

An orbital diagram is a pictorial description of the arrangement of elements within the sublevels of an atom.

For the atom with 16 electrons, the orbital diagram is given as:

                             1s² 2s² 2p⁶  3s² 3p⁴

The representation shows three energy levels: 1, 2 and 3 with 16 electrons depicted by superscript filling them up.

The first energy level is made up of one subshell with two electrons

The second energy level is made up of two subshell with 8 electrons

The third energy level is made up of two subshell with  6 electrons

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.