Question

Gravity → hydrogen + hydrogen ← Gravity

Look at the above diagram. Gravity forces hydrogen atoms together to form
A) electricity.
B) helium.
C) magnetism.
D) planets.

Answer 1

B) helium. Atomic mass of helium is 1, and sum of two hydrogen give atomic mass 2.

Answer 2

The correct option is B.
When two hydrogen atoms comes together they form helium atom. Hydrogen atom has only one electron in its outermost shell. When two hydrogen atoms comes together by reason of some external force, the two atoms will combine together to form helium atom.