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The atomic and mass numbers for four different atoms are given below. Which two are isotopes of the same element? Atom Atomic Number Mass Number A 100 258 B 101 258 C 101 260 D 102 259 A and B C and D B and D B and C

Karen Wright

in Chemistry

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Karen Wright on May 27, 2018

The correct option is B And C. An isotope is defined as two or more forms of the same element that contain equal numbers of protons but different number of neutrons in its nucleus, so that differ in relative atomic mass but not in chemical properties.Therefore, isotopes have the same number of protons but differ in number of neutrons. Due to this fact, isotopes always have the same atomic number but different mass number. You will notice that the atomic number given by the elements B and C are the same [101].


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