Question

the isotope of an atom containing 40 protons and 51 neutrons suddenly has two neutrons added to it. what isotope is created?
○ antimony - 53
○ zirconium - 93
○ zirconium - 53
○ antimony - 93

Explanation:

Step1: Identify element by protons

The number of protons determines the element. 40 protons means the element is zirconium (Zr).

Step2: Calculate new neutron number

Initial 51 neutrons, 2 added. New neutron number is $51 + 2=53$.

Step3: Calculate mass number

Mass number = protons + neutrons. So, $40+53 = 93$. The isotope is Zirconium - 93.

Answer:

B. Zirconium - 93