The Numbers Listed Represent the Number of Electrons in the First,second,and

question 43

Multiple Choice

The numbers listed represent the number of electrons in the first,second,and third energy levels,respectively.On this basis,which of the following is an unstable or reactive atom?

• A)2
• B)2,8,8
• C)2,8
• D)2,8,1

---

Definitions:

Variance

Variance is a statistical measure that represents the degree of spread in a dataset's numbers; it quantifies how far each number in the set is from the mean and thus from every other number in the set.

Marginal Probability

The probability of a single event occurring without consideration of any other events, typically found in the context of probability distributions.

V(X + Y)

The variance of the sum of two random variables, reflecting the spread or variability of their combined distribution.

Probability Distribution

A mathematical description of the likelihood of occurrence of different possible outcomes in an experiment.