which of these pairs of atoms are isotopes
A: scandium-46, titanium-46
B: iron-56, sodium-24
C: chlorine-35, chlorine-37
D: sodium-24, magnesium-24

Taking into account the definition of isotopes, the correct answer is option C: chlorine-35, chlorine-37

First of all, all atoms are composed of a central nucleus in which there are positively charged particles, the protons, and neutrally charged particles, the neutrons, around which other negatively charged particles that are electrons move.

That is, atoms are made up of a nucleus (made up of protons and neutrons) and a shell made up of electrons.

On the other side, isotopes are atoms whose atomic nuclei have the same number of protons but different numbers of neutrons.

The atomic number (Z) indicates the total number of protons in the nucleus of a given atom, while the atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus.

So, in other words, each isotope of the same element has the same atomic number (Z) but each has a different mass number (A). This means that the different isotopes of the same atom differ from each other only by the number of neutrons. So if a neutron is added to an atom, it becomes an isotope of that chemical element.

So, in this case, the correct answer is option C: chlorine-35, chlorine-37, because the two chlorine atoms correspond to the same element but have different atomic masses, whose values ​​are 35 and 37.

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a physical change can happen without changing any characteristics of the substance
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Noah rides his bike 16 kilometers in 2 hours. What is his average speed?

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