Answer: Option (B) is the correct answer.
Explanation:
An atoms consists of protons, neutrons and electrons. Protons are positively charged, neutrons have no charge and electrons are negatively charged.
Also, when an atom is neutral then there are equal number of protons and electrons.
For example, a neutral sodium atom has 11 protons and 11 electrons.
Therefore, we can conclude that modern atomic theory states that atoms are neutral as they have equal number of protons and electrons.
