ELECTRON CONFIGURATION

The Aufbau Principle states that...?

• only two electrons can occupy an orbital

• electrons enter the lowest available energy level

• electrons remain unpaired if possible

• orbitals are regions in space where one is likely to find an electron

  
  

Which one of the following statements about orbitals is incorrect ?

• orbitals can hold up to two electrons

• orbitals are regions in space where one is likely to find an electron

• orbitals can hold two electrons provided they are spinning in the same direction

• s, p, d and f orbitals are possible

The electronic configuration of an atom an element with atomic number 8 is...

• 1s²2s⁶

• 1s²2s²2p⁶

• 2s²2p⁶

• 1s²2s²2p⁴

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which one of the following is not the electronic configuration of atom of a noble gas?

• 1s²

• 1s²2s²

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s²3p⁶

Tags

NGSS.HS-PS1-1

The order of filling orbitals is...

• 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p

• 1s, 2s, 2p, 3s, 3p, 3d, 4p, 3d

• 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p

• 4p, 4s, 3d, 3p, 3s, 2p, 2s, 1s

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Hund's Rule states that...

• you must not sit next to another person on a bus

• electrons enter the lowest available energy level 

• an orbital can hold up to two electrons

• electrons in similar energy orbitals remain unpaired as far as possible

Which of the following atoms has three unpaired electrons?

• B

• C

• N

• O

Tags

NGSS.HS-PS1-1

What is the electronic configuration of a sodium ion Na⁺?

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s¹

• 1s²2s²2p⁶3s²

• 1s²2s²2p⁶3s²3p⁶4s¹

Tags

NGSS.HS-PS1-1

Which is the ground-state electronic configuration of chlorine?

• 1s²2s²2p⁵

• 1s²2s²2p⁶3s²3p⁴

• 1s²2s²2p⁶3s²3p⁵

• 1s²2s²2p⁸3s²3p⁵

Tags

NGSS.HS-PS1-1

The valence electrons of representative elements are

• in s orbitals only.

• located in the outermost occupied major energy level.

• located closest to the nucleus.

• located in d orbitals.

• located in the innermost occupied shell.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2