Please answer quick important please and explain it clearly also pls

1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.

Will mark brainliest how many electrons can be held in the energy level n = 4?