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The last member of group 18 is:...

The last member of group 18 is:

A

Helium

B

Neon

C

Argon

D

Radon

Text Solution

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The correct Answer is:
To determine the last member of Group 18 (the noble gases), we can follow these steps: ### Step 1: Identify the Group 18 Elements Group 18 of the periodic table consists of the following elements: - Helium (He) - Neon (Ne) - Argon (Ar) - Krypton (Kr) - Xenon (Xe) - Radon (Rn) ### Step 2: Understand the Characteristics of Group 18 Elements Group 18 elements are known as noble gases. They have a complete valence shell, which makes them very stable and largely unreactive with other elements. ### Step 3: Determine the Order of Elements in Group 18 The elements in Group 18 are arranged in order of increasing atomic number: 1. Helium (He) - Atomic number 2 2. Neon (Ne) - Atomic number 10 3. Argon (Ar) - Atomic number 18 4. Krypton (Kr) - Atomic number 36 5. Xenon (Xe) - Atomic number 54 6. Radon (Rn) - Atomic number 86 ### Step 4: Identify the Last Member From the list, we can see that Radon (Rn) is the element with the highest atomic number in Group 18, making it the last member of this group. ### Conclusion The last member of Group 18 is Radon (Rn), which has an atomic number of 86. ### Final Answer **Radon (Rn)** ---
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