Shorthand Electron Configuration

• What is the main topic of the video?

  Shorthand electron configuration
• How many electrons does sodium have?

  11 electrons
• What is the electron configuration of sodium?

  2 electrons in 1s, 2 in 2s, 6 in 2p, 1 in 3s
• Which electrons are involved in chemical reactions?

  Electrons in the outer shell
• What is the shorthand version of writing electron configuration?

  Using noble gas notation
• What noble gas precedes sodium in the periodic table?

  Neon
• How many electrons does neon have?

  10 electrons
• What is the shorthand electron configuration for sodium?

  Neon notation with 3s electron
• When should you write the full electron configuration?

  Unless asked for shorthand version
• What are the full and shorthand electron configurations for beryllium?

  • Full: 1s$^2$ 2s$^2$
  • Shorthand: He 2s$^2$
• What are the full and shorthand electron configurations for sulfur?

  • Full: 1s$^2$ 2s$^2$ 2p$^6$ 3s$^2$ 3p$^4$
  • Shorthand: Ne 3s$^2$ 3p$^4$
• What are the full and shorthand electron configurations for calcium?

  • Full: 1s$^2$ 2s$^2$ 2p$^6$ 3s$^2$ 3p$^6$ 4s$^2$
  • Shorthand: Ar 4s$^2$
• How many electrons does manganese have?

  25 electrons
• What is the electron configuration of manganese?

  1s$^2$ 2s$^2$ 2p$^6$ 3s$^2$ 3p$^6$ 3d$^5$ 4s$^2$
• What noble gas precedes manganese in the periodic table?

  Argon
• What is the shorthand electron configuration for manganese?

  Ar 3d$^5$ 4s$^2$
• Why do we show the d subshell in shorthand configurations for d-block elements?

  Because they can be involved in reactions
• What is the process for writing shorthand electron configurations?

  1. Identify the element's position on the periodic table.
  2. Find the noble gas in the previous period.
  3. Write the noble gas symbol.
  4. Add the remaining electron configuration.