Use the periodic table to write the electron configuration for barium (Ba) in noble-gas notation.

Answer is: [Xe] 6s².

Barium is metal from second group of periodic table of elements.

Barium has atomic number 56, it has 56 protons and 56 electrons.

Electron configuration of barium atom:

₅₆Ba 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 6s².

Xenon (symbol: Xe) is an element (noble gas) with atomic number 54, which means it has 54 protons and 54 electrons.

Electron configuration of xenon atom:

₅₄Xe 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶.

The answer is [Xe] 6s2