consider the species 72zn, 75Asanf 74Ge These species have a The same number of protons b the same number of electrons c the same number of neutrons d the same number of protons and neutrons e the same mass number
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Option C is the correct answer. The given species has the same number of neutrons.
- The given species are Zn, As, and Ge with mass numbers 72, 75, 74 respectively.
- The atomic numbers of Zn, As, and Ge is 30, 33, and 32 respectively.
- The number of protons in an element is equal to the atomic number of the element.
- The number of neutrons is equal to the difference between the mass number and the atomic number of the element.
- The Given species are Zn, As, and Ge with atomic weights 72, 75, and 74, and the atomic numbers are 30, 33, 32 respectively.
=> The number of neutrons in Zn = Mass number of Zn– Atomic number of Zn,
=> Number of neutrons = 72 – 30 = 42.
=> The number of neutrons in As = Mass number of As– Atomic number of As,
=> Number of neutrons = 75 – 33 = 42.
=> The number of neutrons in Ge = Mass number of Ge– Atomic number of Ge,
=> Number of neutrons = 74 – 32 = 42.
- The number of neutrons is the same in each case.
Therefore, option c is the correct answer. The given species has the same number of neutrons.
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