JAMB - Chemistry (1987 - No. 30)
An isotope has an atomic number of 17 and a mass number of 36. Which of the following gives the correct number of neutrons and protons in an atom of the isotope?
Neutrons 53, Protons 17
Neutrons 17, Protons 36
Neutrons 19, Protons 17
Neutrons 36, Protons 17
Explicació
Mass number = number of protons + number of neutrons
36 = 17 + X; X = 36 -17 = 19
19 neutrons and 17 protons
36 = 17 + X; X = 36 -17 = 19
19 neutrons and 17 protons