Which of the following elements do not possess neutrons inside their nucleus?
hydrogen
The nucleus of an atom contains protons and neutrons. The number of neutrons in the nucleus is given by the mass number minus the atomic number. The most common isotope of hydrogen (protium, 1H) has mass number 1 and atomic number 1, so it has 1 − 1 = 0 neutrons in its nucleus.
Neon has 10 protons and about 10 neutrons in its common isotope, argon has 18 protons and 22 neutrons in 40Ar, and helium has 2 protons and 2 neutrons in 4He. All of these carry neutrons in their nuclei. Only ordinary hydrogen has none.
Hence, the answer is hydrogen.
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