Chlorine.
Chlorine
Chlorine is the most reactive gas element. Chlorine is in the halogen family.
Hydrogen is not only the lightest element of all, it is also very reactive.
No, argon is not more reactive than oxygen. In fact, argon is a noble gas and is very non-reactive, while oxygen is a highly reactive element that readily participates in chemical reactions.
Most elements are non reactive to noble gases.
There are many examples. Ni is a example element.
This element is very reactive.
Chlorine (Cl) is a natural chemical element, a gas, very reactive, extremely useful in industry, toxic, with a pungent smell.
Hydrogen gas is stable under certain conditions but can be reactive under others. It is flammable and can ignite in the presence of oxygen. In its elemental form, hydrogen is colorless, odorless, and tasteless.
Berylium is a alkaline earth metal and is fairly reactive. Argon is a noble gas that is very unreactive. Therefore Be is more reactive
the very non reactive elements are very valuable but they are platinium, gold and silver.
Noble gasses are least reactive of all the elements. So the least reactive element in the period 4 is Krypton. It is a noble gas with an atomic number of 36.