Question

give the unit to measure size of atom and give size of hydrogen atom​

Answer 1

Answer:

The units for atomic radii are picometers, equal to 10−12 meters. As an example, the internuclear distance between the two hydrogen atoms in an H2 molecule is measured to be 74 pm. Therefore, the atomic radius of a hydrogen atom is 742=37 pm 74 2 = 37 pm .

Answer 2

The unit to measure the  size of an  atom and give the  size of the  hydrogen atom​:

The size of an atom is measured in nanometers, while the size of a hydrogen atom is 0.1 nm.

Atomic size:

• The distance between the nucleus and the outermost (valence) shell of an atom is defined as its atomic size.
• The atomic size of elements grows as you progress through the group, and decreases as you progress from left to right.
• As the number of energy shells of the atoms grows from top to bottom in the group, the atomic radius increases as well.