Hydrogen resembles the elements of groups:
Correct answer: D. I-A, IV-A and VII-A
- A. I-A, V-A and VIII-A
- B. I-A, IV-A and VI-A
- C. I-A, II-A and VII-A
- D. I-A, IV-A and VII-A
Explanation
Hydrogen is unique in its periodic behavior but shows similarities to several groups. It resembles group I-A because it has one valence electron and can lose this electron to form a cation. It resembles group IV-A because it can share electrons, akin to the group IV-A elements with half-filled valence shells. Additionally, it resembles group VII-A in its ability to gain an electron and form an anion, similar to the halogens. The other options incorrectly associate hydrogen with groups where it does not demonstrate such chemical similarities.
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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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