Which one among the following statements about an atom is NOT correct?

Correct Answer: All the atoms of a given element will always have the same number of neutrons.

Subject: chemistry

• Atoms of different elements may have the same mass numbers.
• All the atoms of a given element will always have the same number of neutrons.
• Atoms are always electrically neutral in nature.
• Atoms aggregate in large numbers to form the matter that we can see, feel, and touch.

Explanation: • <b>Key Fact</b> Statement B is incorrect because atoms of the same element can have different numbers of neutrons. These are called Isotopes. • <b>Supporting Detail</b> For example, Carbon-12 has 6 neutrons, while Carbon-14 has 8 neutrons, yet both are Carbon atoms. • <b>Related Concept</b> Statement A is correct. Atoms of different elements with the same mass number are called Isobars (e.g., Ar-40 and K-40). • <b>Why wrong options are wrong</b> The question asks for the INCORRECT statement. Options A, C, and D are factually correct statements about atoms. • <b>Exam Trick</b> Same Element = Same Protons (Always!). Different Neutrons = Isotopes. • <b>Additional Info</b> Atoms are electrically neutral because protons equal electrons.

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