Question

which is the smallest element Hydrogen or helium ?​

Answer 1

Answer:

Helium

Explanation:

$\implies$ $\sf{Helium}$ is smaller than hydrogen atom but in terms of size.

$\implies$ As we know that atomic radius increases from top to bottom in a group while it decreases from left to right across a period.

$\implies$ Though helium is more in weight than Hydrogen element due to more electrons and protons, but atomic radii of helium is smaller than hydrogen.

$\implies$ helium is the smallest element in whole Modern periodic table.

$\implies$ Its atomic radius is 31 pm while hydrogen is 53 pm.

$\implies$ Francium Is the biggest atom in whole Modern periodic table.

Answer 2

Answer:

Helium

Explanation:

\implies⟹ \sf{Helium}Helium is smaller than hydrogen atom but in terms of size.

\implies⟹ As we know that atomic radius increases from top to bottom in a group while it decreases from left to right across a period.

\implies⟹ Though helium is more in weight than Hydrogen element due to more electrons and protons, but atomic radii of helium is smaller than hydrogen.

\implies⟹ helium is the smallest element in whole Modern periodic table.

\implies⟹ Its atomic radius is 31 pm while hydrogen is 53 pm.

\implies⟹ Francium Is the biggest atom in whole Modern periodic table.