Explaining the increase in reactivity
1 mark · EasyWhich Group 1 element has its outer electron closest to the nucleus? Give the element's name.
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Lithium
Also accept: Li; lithium
Common mistakes: Sodium; Potassium
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B1 · 1 mark · Identifies lithium as the Group 1 element with the outer electron closest to its nucleus.
Worked solution
Lithium.