Which one of the following groups consists entirely of non-metals?
Correct answer: D. VIIA
- A. IIA
- B. IVA
- C. VIA
- D. VIIA
Explanation
The correct answer is Group VIIA, which is composed entirely of non-metals known as the halogens. These elements include fluorine, chlorine, bromine, iodine, and astatine, all of which are non-metals. Group IIA contains alkaline earth metals, which are metallic. Group IVA includes a mix of metals, metalloids, and non-metals, while Group VIA includes some non-metals but also metalloids and metals. Therefore, only Group VIIA fulfills the criterion of consisting entirely of non-metals.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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