Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged).
Here's the solution,
we know,
<u>potential energy</u> = mgh
where,
- m = mass = 0.5 kg
- g = acc due to gravity = 9.8 m/s²
- h = height = 0.8 m (80 cm)
So,
=》

=》

A molecular formula is an expression that states the number and type of atoms present in a molecule of a substance.
Example : H2O (water) There are 2 atoms of Hydrogen and 1 atom of Oxygen in this substance