Answer: a) chromium-52 : protons = 24, neutrons = 28
selenium - 80 : protons = 34, neutrons = 46
molybdenum-98: protons = 42, neutrons = 56
xenon-132: protons = 54, neutrons = 78
ytterbium-174 : protons = 70, neutrons = 104
Explanation:
Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.
Thus, number of protons = atomic number
Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.
Mass number = Number of protons + Number of neutrons
a) chromium-52 :
Atomic number of Chromium is 24 hence number of protons = 24
52= 24+ Number of neutrons
Number of neutrons = 28
b) selenium - 80 :
Atomic number of selenium is 34 hence number of protons = 34
80 = 34 + Number of neutrons
Number of neutrons = 46
c) molybdenum - 98 :
Atomic number of molybdenum is 42 is hence number of protons = 42
98 = 42 + Number of neutrons
Number of neutrons = 56
d) xenon-132:
Atomic number of xenon is 54 hence number of protons = 54
132 = 54 + Number of neutrons
Number of neutrons = 78
e) ytterbium-174:
Atomic number of ytterbium is 70 and hence number of protons = 70
174 = 70 + Number of neutrons
Number of neutrons = 104
