High School

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Which of the following statements does the symbol [tex]^{115}_{49}\text{In}[/tex] imply?

A. Element with atomic number 49 and mass number 115
B. Isotope with 49 protons and 115 electrons
C. Isotope with 115 protons and 49 neutrons
D. Element with 115 protons and 49 electrons

Answer :

Final answer:

The symbol ¹¹⁵₄₉{IN} describes an isotope of indium with an atomic number of 49 and a mass number of 115, meaning it has 49 protons and 66 neutrons.

Explanation:

The symbol ¹¹⁵₄₉{IN} implies an isotope of the element indium with an atomic number of 49 and a mass number of 115. In other words, it has 49 protons and because the mass number is the sum of protons and neutrons in an atom, it therefore has 115 - 49 = 66 neutrons. Answer (a) 'Element with atomic number 49 and mass number 115' is correct. It is important to also note the presence of equal numbers of electrons and protons in a neutral atom of this isotope, which would be 49 electrons here.

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