Hydrogen.
Hydrogen has the smallest atomic size of any element.
Hydrogen.
Hydrogen
Hydrogen
Hydrogen.
Hydrogen
It is hydrogen.
hydrogen This is because it has the smallest Relative Atomic Mass =]
Hydrogen is a gas element. It had the smallest atomic number.
The element with the smallest atomic mass is hydrogen, which has an atomic mass of approximately 1.008 atomic mass units. Its atomic number is 1, indicating that it has one proton in its nucleus. Hydrogen is the simplest and most abundant element in the universe.
Hydrogen. Atomic number is defined by the number of protons in an element and increases from left to right (H=1, He=2, Li=3, etc.).
Hydrogen is a non metal element. Atomic number of it is 1.