Question

If you added up the atomic numbers of the six noble gases on the Periodic Table of Elements, what's the total?

A. 149.
B. 173.
C. 206.
D. 245.

Answer 1

The total sum of the atomic numbers of the six noble gases (Helium, Neon, Argon, Krypton, Xenon, Radon) is 206, which is choice C on the options provided.

Step-by-step explanation:

To calculate the sum of the atomic numbers of the six noble gases on the Periodic Table of Elements, we will add together the atomic numbers of Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).

The atomic numbers are as follows:

• Helium (He) - 2
• Neon (Ne) - 10
• Argon (Ar) - 18
• Krypton (Kr) - 36
• Xenon (Xe) - 54
• Radon (Rn) - 86

Adding these numbers:

2 + 10 + 18 + 36 + 54 + 86 = 206

Therefore, the total sum of the atomic numbers of the six noble gases is 206, which corresponds to answer choice C