TRANSITION METALS AND ELECTRONIC CONFIGURATION

Electron subshells are most stable

• with all orbitals full or all empty

• with orbitals exactly 3/4 full

• with orbitals exactly 3/4 empty

• with orbitals exactly 1/2 full

Predict how the valence electrons in iron metal (iron 0) should be organized.

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Use your stability and filling rules to predict Cu⁰'s valence shell. (4s and 3d subshells)

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Chemists can identify the composition of some unknown salts by conducting a flame test. When potassium salts are heated in a flame, a purple color is observed.

This is due to the movement of electrons between energy levels. What is the electron configuration of a potassium atom at ground state?

• 1s²; 2s²; 2p⁶; 3s²; 3p⁶; 4d¹

• 1s²; 2s²; 2p⁶; 3s²;3p⁶; 3d¹

• 1s²; 2s²; 2d⁶; 3s²; 3d⁶; 4s¹

• 1s²; 2s²; 2p⁶; 3s²; 3p⁶; 4s¹

The electron configuration of an atom is 1s²2s²2p⁶.  The number of electrons in the atom is 

• 3
• 6
• 8
• 10

Tags

NGSS.HS-PS1-1

What atom matches this electron configuration?
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

• Zinc
• Copper
• Nickel
• Germanium

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶4s²3d¹

Tags

NGSS.HS-PS1-1

The electron configuration of an atom is 1s²2s²2p⁶.  The number of valence electrons in the atom is 

• 3
• 6
• 8
• 10

Tags

NGSS.HS-PS1-1

Which of the following properties about transition elements is incorrect?

• Transition metals have variable oxidation state.

• They are the only elements that can form coloured ions in aqueous solution.

• Transition elements are good conductors

• They are the only elements that can form complexes.

Atoms are neutral because...

• They have 3 particles

• Neutrons and protons = 0

• They have equal numbers of protons and electrons

• They have a pH of 7