Hydrogen loses an electron to form:
Correct answer: A. H+
- A. H+
- B. H2−2
- C. H
- D. H−
Explanation
Explanation:The correct answer is H+ because when hydrogen loses an electron, it becomes a positively charged ion called a hydrogen ion or a proton. This is a dihydrogen anion which consists of two hydrogen atoms and two extra electrons, and is not formed by the loss of a single electron by hydrogen. This refers to the hydrogen atom which has one proton and one electron, and does not involve the loss of an electron. This is a hydride ion which is formed when hydrogen gains an electron, rather than loses an electron.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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