Asked by qp
The symbol for a radioactive nuclide is Superscript 131 subscript 56 upper B a.. Which statement is correct?
The atomic number of the radioactive nuclide is 75.
The mass number of the radioactive nuclide is 131.
The number of neutrons that are present in the nucleus of each atom is 56.
The number of protons that are present in the nucleus of each atom is 131.
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The correct statement is: The mass number of the radioactive nuclide is 131.
Explanation: In the notation ¹³¹₅₆Ba, the superscript (131) is the mass number A (protons + neutrons) and the subscript (56) is the atomic number Z (number of protons). The number of neutrons = A − Z = 131 − 56 = 75.
Explanation: In the notation ¹³¹₅₆Ba, the superscript (131) is the mass number A (protons + neutrons) and the subscript (56) is the atomic number Z (number of protons). The number of neutrons = A − Z = 131 − 56 = 75.
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