Question

an atom of $^{118}$xe contains ______ neutrons.
54
172
64
110
118
question 20 1 pts
predict the charge of the most stable ion of aluminum.
3+
1+
3-
2+
1-

Explanation:

Step1: Recall atomic number of Xe

The atomic number of xenon (Xe) is 54.

Step2: Use neutron - proton relationship

The mass number is 118. Neutrons = Mass number - Atomic number. So, neutrons = 118 - 54 = 64.

Step3: Recall electron - loss/gain for aluminum

Aluminum (Al) has an atomic number of 13. Its electron configuration is [Ne]3s²3p¹. It loses 3 electrons to achieve a stable noble - gas configuration. So, it forms a 3+ ion.

Answer:

First question: C. 64
Second question: A. 3+