Elements in Groups IA and VIIA of the Periodic Table

question 30

Multiple Choice

Elements in groups IA and VIIA of the periodic table possess, respectively, how many valence electrons?

• A) 1 and 1
• B) 1 and 7
• C) 7 and 1
• D) 8 and 8

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Definitions:

Kruskal-Wallis Test

A nonparametric statistical test used to compare three or more groups based on ranked data. It is an extension of the Mann-Whitney U test for more than two groups.

Null Hypothesis

The hypothesis in statistical analysis that proposes there is no significant difference or relationship between specified populations, any observed difference being due to sampling or experimental error.

Distribution

A statistical term describing the way values of a variable are spread or dispersed across a range.

Significance Level

A threshold chosen by the researcher to denote the probability below which a result is considered statistically significant, indicating that the observed result would be unlikely under the null hypothesis.