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What are the isotopic symbols for 18 protons and 23 neutrons?

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a

b

c

d

answer is A.

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Detailed Solution

Concept- The number of protons in the nucleus of an atom of any element is expressed as its atomic number. Since an atom's protons and electrons must both have the same number for it to be stable, atomic numbers can also refer to the number of electrons that make up an atom of that particular element.
Although the quantity of protons and electrons can vary, the element will still create an unstable ion.
We arrive at a total of 41 by adding the protons and neutrons listed in the question. Thus, the nucleus of an isotope of argon with 23 neutrons has a total of 41 particles.
Hence, the correct answer is option (1).

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