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Question
Write the name and symbol of the element from the description.
The noble gas with the smallest atomic radius.
Solution
Name: Helium
Symbol: He
Explanation:
Helium (He) is the noble gas with the smallest atomic radius. Although noble gases have complete outer electron shells and do not readily form bonds, helium has the smallest atomic size because it has only two electrons and experiences strong nuclear attraction, pulling the electrons closer to the nucleus.
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| Atomic radius (pm) | 231 | 186 | 244 | 262 | 151 |
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On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.
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The element A would have ______ atomic size than B.
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Give reason for the following:
The size of a Cl− ion is greater than the size of a Cl atom.
