Which of the following is an impossible electronic configuration?

• 1s²2s²2p⁵3s²3p⁵

• 1s²2s²2p⁶3s²3p⁶

• 1s²2s²2p⁶2d¹⁰3s²3p⁶

• 1s²2s²2p⁶3s²3p⁶3d⁵

Tags

NGSS.HS-PS1-1

Which of the following is the ground-state configuration for the atoms of a transition element?

• 1s²2s²2p⁵3s²3p⁵4s²3d³

• 1s²2s²2p⁶3s²3p⁶4s²3d⁵

• 1s²2s²2p⁶2d¹⁰3s²4s²3p⁵

• 1s²2s²2p⁶3s²3p⁵

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In which of the following groups are the three species isoelectronic?

• S^2¯, K⁺, Ca²⁺
  
• Sc, Ti, V²⁺
• O^2¯, S^2¯, Cl¯
• Mg²⁺, Ca²⁺, Sr²⁺

Tags

NGSS.HS-PS1-1

Gaseous atoms of which of the following elements are paramagnetic: Ca, V, Co, Zn, As ?

• Ca and As only
• Zn and As only
• Ca, V, and Co only
• V, Co, and As only

Tags

NGSS.HS-PS1-1

Which of the following is the ground-state configuration of a negative ion of a halogen?

• 1s²2s²2p⁵3s²3p⁵
  
• 1s²2s²2p⁶3s²3p⁶
• 1s²2s²2p⁶2d¹⁰3s²3p⁶
• 1s²2s²2p⁶3s²3p⁶3d⁵

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Element X, is configured as 1s² 2s² 2p⁶ 3s² 3p³. The compound most likely formed with Mg is…

• Mg₂X

• MgX₂

• MgX₃

• Mg₃X₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2