Which of the following configurations represents a noble gas?

Which of the following configurations represents a noble gas?

Step 1: Understand what a noble gas is. Noble gases are elements that have a full outer shell of electrons, making them stable and unreactive.
Step 2: Look at the electron configuration given in the question, which is 1s2 2s2 2p6.
Step 3: Break down the electron configuration: 1s2 means there are 2 electrons in the first shell, 2s2 means there are 2 electrons in the second shell, and 2p6 means there are 6 electrons in the second shell.
Step 4: Add the electrons in the outer shell (2s and 2p): 2 (from 2s) + 6 (from 2p) = 8 electrons in the outer shell.
Step 5: Recognize that having 8 electrons in the outer shell is characteristic of noble gases.
Step 6: Identify that the element with the configuration 1s2 2s2 2p6 is Neon, which is a noble gas.

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