Answer: The correct answer is Option D.
Explanation:
The general representation of an atom is given by: [tex]_Z^A\textrm{X}[/tex], where,
A = Mass number of the element
Z = Atomic number of the element
X = Symbol of the element
Atomic number is defined as the number of electrons or protons present in an atom.
Atomic number = Number of protons = Number of electrons
Mass number is defined as the sum of number of protons and number of neutrons in an element.
Mass Number = Number of protons + number of neutrons
From the given options:
- Option 1: [tex]_{34}^{79}\textrm{Se}[/tex]
Z = 34 = Number of protons
A = 79 = Number of neutrons + number of protons
Number of neutrons = 79 - 34 = 45
- Option 2: [tex]_{35}^{80}\textrm{Br}[/tex]
Z = 35 = Number of protons
A = 80 = Number of neutrons + number of protons
Number of neutrons = 80 - 35 = 45
- Option 3: [tex]_{32}^{73}\textrm{Ge}[/tex]
Z = 32 = Number of protons
A = 73 = Number of neutrons + number of protons
Number of neutrons = 73 - 32 = 41
- Option 4: [tex]_{36}^{84}\textrm{Kr}[/tex]
Z = 36 = Number of protons
A = 84 = Number of neutrons + number of protons
Number of neutrons = 84 - 36 = 48
From the above information, it is visible that Krypton has most neutrons.
Hence, the correct answer is Option D.
