Question

"X is a particle with 18 electrons and 20 neutrons. Which of the following particles could be X? 1: Ar > 2: 40Ca2+ 3: 39K A. 1, 2 and 3 B. Only 1 and 2 C. Only 2 and 3 D. Only 1

Answer 1

To determine which of the given particles could be X, we compare the number of electrons and neutrons. The only particle that matches the given information is 40Ca2+ (Calcium).

Step-by-step explanation:

To determine which of the given particles could be X, we need to compare the number of electrons and neutrons of X with the number of electrons and neutrons of the given particles. X has 18 electrons and 20 neutrons.

• Option 1: Ar (Argon) has 18 electrons and 22 neutrons, so it does not match the given information.
• Option 2: 40Ca2+ (Calcium) has 18 electrons and 20 neutrons, which matches the given information.
• Option 3: 39K (Potassium) has 19 electrons and 20 neutrons, so it does not match the given information.

Therefore, the only particle that matches the given information is 40Ca2+ (option 2).