Multiple Choice
Which of the following species is isoelectronic with Ne?
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2. Atoms & Elements
Ions
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Which of the following best describes a hydronium ion?
A
An ion formed when a water molecule gains a proton, resulting in H3O+
B
An ion formed when a hydrogen atom loses an electron, resulting in H-
C
An ion formed when a hydrogen molecule gains an electron, resulting in H2-
D
An ion formed when a water molecule loses a proton, resulting in OH-
Verified step by step guidance1
Understand that a hydronium ion is related to water (H2O) and involves the addition or removal of a proton (H+).
Recall that a proton (H+) is essentially a hydrogen nucleus without its electron, so when a water molecule gains a proton, it forms a positively charged ion.
Recognize that when water gains a proton, the resulting ion is H3O+, which is called the hydronium ion.
Compare the other options: losing a proton from water forms OH- (hydroxide ion), losing an electron from hydrogen forms H+, and gaining an electron forms H- (hydride ion), none of which are hydronium.
Conclude that the hydronium ion is best described as the ion formed when a water molecule gains a proton, resulting in H3O+.
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