Electron Configuration

How many valence electrons does sodium have in ground state?

• 1
• 3
• 2
• 8
• 11

Which of the following would have 3 valence electrons in period (row) 3?

• Al
• Li
• B
• Fe
• Ti

Identify the ground state electron configuration for an atom of potassium. Type without spaces.

• 2-8-14-2
• 2-8-5
• 2-8-8-1
• 2-8-4-1

Which part of a lithium atom in the ground state is represented by the dots in its Lewis electron-dot diagram?

• the inner electrons that make up the kernel of the lithium atom
• the outermost electron in the second shell
• the valence protons in the nucleus
• the neutrons in the outer valence electron shell

Which of the following Lewis dot diagrams would represent an an oxygen atom. Write the letter in the space provided.

• B
• D
• E
• F
• G

Which of the following Lewis dot diagrams would represent a magnesium atom. Write the letter in the space provided.

• B
• C
• D
• F
• H

Which of the following Lewis dot diagrams would represent an element in group 14. Write the letter in the space provided.

• A
• H
• G
• D
• E

Which element could be represented by the following Bohr model?

• He
• F
• Ar
• Ne
• Na

Which element could be represented by the following Bohr model?

• He
• F
• Ar
• Ne
• C

Which element would have an atom with the electron configuration 2-8-3 in ground state? (Write the symbol)

• Cu
• Ga
• Al
• Ca
• P