Why is helium less reactive than hydrogen?

Each helium atom has a full valence electron shell, but each hydrogen atom only has one valence electron. Explanation: ... H has one electron in the outer shell therefore its reactive by gaining or losing the outermost electron. therefore H is more reactive than He as it has an incomplete valence electron shell.

Explanation:

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.