From its electronic configuration, predict which of the first 10 elements would be most similar in chemical behavior to the as yet undiscovered element 168.

Ne

Explanation:

Neon is the 10th element in the periodic table, and it has all of its orbitals filled up with electrons, the electronic configuration of the element that contains 168 electrons will be an electronic configuration that ends up with all of the orbitals filled up, so it would be most similar to the Neon which is a noble gas, meaning that 168th element will also be a noble gas.