Barium Electron Configuration Concepts

This video tutorial explains how to write the electron configuration for barium, which has an atomic number of 56. The tutorial begins by identifying barium's position on the periodic table and explaining that it has 56 protons and electrons. The video then provides a detailed, step-by-step guide to writing the electron configuration using orbital blocks, starting from 1s and moving through to 6s. It also covers the use of condensed notation by referencing the noble gas xenon. The tutorial concludes with a note on the order of orbitals and thanks viewers for watching.

What is the atomic number of barium?

• 55

• 56

• 54

• 57

In a neutral atom of barium, how many electrons are present?

• 57

• 56

• 55

• 54

Which orbital do we start with when writing the electron configuration?

• 1s

• 2s

• 2p

• 3s

How many electrons can the s orbital hold?

• 4

• 8

• 6

• 2

What is the maximum number of electrons that can occupy a p orbital?

• 4

• 6

• 8

• 2

After filling the 5p orbital, which orbital is filled next in barium's electron configuration?

• 5f

• 6s

• 5d

• 4d

What is the condensed electron configuration notation for barium?

• [Kr] 5s2 4d10 5p6 6s2

• [Xe] 6s2

• [Xe] 5d10 6s2

• [Kr] 4d10 5p6 6s2

Which noble gas is used in the condensed notation for barium?

• Xenon

• Neon

• Argon

• Krypton

Why might the 4s orbital be written before the 3d orbital in electron configurations?

• 4s has higher energy

• They have similar energies

• 3d is filled first

• 4s is closer to the nucleus

What is the significance of the order of orbitals in electron configurations?

• It determines the element's reactivity

• It changes the atomic number

• It affects the atomic mass

• It shows the filling order of electrons