Question

Which one of these four atoms has the most neutrons?

Answer 1

The answer is D. Kr because A and B have 45 neutrons and C has 41 neutrons. Hope this helps!

Answer 2

Answer: The correct answer is Option D.

Step-by-step explanation:

The general representation of an atom is given by:
`_Z^A\textrm{X}`, 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:
  `_(34)^(79)\textrm{Se}`

Z = 34 = Number of protons

A = 79 = Number of neutrons + number of protons

Number of neutrons = 79 - 34 = 45

• Option 2:
  `_(35)^(80)\textrm{Br}`

Z = 35 = Number of protons

A = 80 = Number of neutrons + number of protons

Number of neutrons = 80 - 35 = 45

• Option 3:
  `_(32)^(73)\textrm{Ge}`

Z = 32 = Number of protons

A = 73 = Number of neutrons + number of protons

Number of neutrons = 73 - 32 = 41

• Option 4:
  `_(36)^(84)\textrm{Kr}`

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.