Assertion: Atom is electrically neutral.Reason: A neutral particle, neutron is present in the nucleus of atom.

Step 1: Understand the assertion and reason. The assertion states that an atom is electrically neutral, while the reason states that a neutral particle, the neutron, is present in the nucleus of the atom.

Step 2: Analyze the assertion. The assertion claims that an atom is electrically neutral. This means that the overall charge of an atom is zero, indicating that it has an equal number of protons and electrons.

Step 3: Analyze the reason. The reason states that a neutral particle, the neutron, is present in the nucleus of the atom. Neutrons are subatomic particles that have no charge, meaning they are electrically neutral.

Step 4: Evaluate the relationship between the assertion and reason. The reason supports the assertion because the presence of neutrons in the nucleus contributes to the overall neutral charge of the atom. Since neutrons have no charge, they do not affect the overall electrical neutrality of the atom.

Step 5: Conclusion. Based on the analysis, the assertion that an atom is electrically neutral is supported by the reason that a neutral particle, the neutron, is present in the nucleus of the atom. Therefore, the assertion and reason are both correct.