Question

which of the following is the electron configuration for ba? answer: a xe6s^2 b rn6s^2 c xe6s^1 d xe7s^2 e rn7s^2

Explanation:

Step1: Identify noble - gas core for Ba

Barium (Ba) has an atomic number of 56. The noble - gas that precedes Ba in the periodic table is Xenon (Xe) with an atomic number of 54.

Step2: Determine outer - shell electrons

After filling the [Xe] core, Ba has 2 additional electrons in the 6s orbital. So the electron configuration of Ba is [Xe]6s².

Answer:

A. [Xe]6s²