An atomic cation with a charge of +1 has the following electron configuration: 1s22s22p6?

For electro configuration : 1s² 2s² 2p⁶, the cation has 10 electrons.
The original atom loses 1 electron to give the cation. Therefore, the original atom has 11 electrons, and thus the atomic number of the original atom is 11.
The atomic number of sodium (Na) is 11. Hence, the original atom is sodium atom (Na), and the cation is sodium ion (Na⁺).

What is the chemical symbol for the ion? …. Na⁺
How many electrons does the atom have? …. 10
How many 1s electrons are in the ion? …. 2