Which element in period 4 is the most chemically active non-metal?

For the following, determine the type of reaction and then give products.

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

Why are people not able to skip a dive to the deepest part of the ocean