Consider the isotope 
Br.The atomic number is ________,and the mass number is ________.
Definitions:
Standard Error
The typical deviation found within the distribution of samples for a statistic, usually referring to the mean.
Independent Samples
Independent samples refer to two or more groups of data that are collected from separate, non-overlapping populations, ensuring they are not influenced by each other.
Normal Populations
The term "normal populations" relates to groups or sets of entities that exhibit characteristics distributed according to a normal (Gaussian) distribution.
Sampling Distribution
The likelihood distribution of a specific statistic derived from a random sample, which is utilized to draw conclusions about the broader population that the sample represents.
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