Question

আধুনিক পর্যায় সূত্র বিবৃত করো​

Answer 1

Answer:

I am not understand your question dear sorry

Answer 2

Explanation:

Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass.