Answer
Please see the answer below.
Work Step by Step
Number of protons in an atom = Atomic number
For neutral atoms, number of protons = number of electrons.
For cations, number of electrons = Atomic number- Charge on the atom.
Number of neutrons = Atomic number- Mass number
a) Cr- neutral atom
Atomic number =24
Mass number = 52
Number of protons = 24
Number of electrons = 24
Number of neutrons = 28
b) Cd- neutral atom
Atomic number =48
Mass number = 112
Number of protons = 48
Number of electrons = 48
Number of neutrons = 64
c) Ba- cation (2+ charge)
Atomic number =56
Mass number = 137
Number of protons = 56
Number of electrons = 54
Number of neutrons = 83
d) Cu- cation (1+ charge)
Atomic number =29
Mass number = 63
Number of protons = 29
Number of electrons = 28
Number of neutrons = 34
e) Fe- cation (2+ charge)
Atomic number =26
Mass number = 56
Number of protons = 26
Number of electrons = 24
Number of neutrons = 30
f) Fe- cation (3+ charge)
Atomic number =26
Mass number = 55
Number of protons = 26
Number of electrons = 23
Number of neutrons = 29
