In a neutral atom, protons equal electrons, so there are 31 protons. Subtracting 31 protons from the mass number 70 gives 39 neutrons present in the nucleus of atom X.
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In a neutral atom, protons equal electrons, so there are 31 protons. Subtracting 31 protons from the mass number 70 gives 39 neutrons present in the nucleus of atom X.
For a neutral atom of element X, the number of protons equals the number of electrons, which is 31. The superscript 70 represents the mass number, which is the total count of protons and neutrons combined. Subtracting 31 protons from the mass number 70 yields 39 neutrons. Therefore, there are 39 neutrons in its nucleus.
For more NCERT Solutions of Class 9 Science Exploration Chapter 8 Journey Inside the Atom Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-8/