How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0

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

• 3
• 6
• 8
• 10

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

NGSS.HS-PS1-2

What is incorrect about this orbital diagram?

• Both arrows in the filled 2p box should be pointing the same direction

• There is nothing incorrect with this diagram

• In the there should only be 1 arrow in the first 2p box and one in the 2nd 2p box

• All the arrows should be pointing the same direction.

Tags

NGSS.HS-PS1-1

No two electrons in the same atom can have the same four quantum numbers.

• Aufbau Principle

• Pauli's Exclusion Principle

• Hund’s Rule

• Noble gas notation

All orbitals of equal energy (degenerate orbitals) are occupied by one electron before any single orbital is occupied by a second electron.

• Aufbau Principle

• Pauli's Exclusion Principle

• Hund’s Rule

• Core Notation

An atom with a charge of 2- will have...

• 2 more electrons than protons

• 2 more neutrons than electrons

• 2 more protons than electrons

• 2 electrons less than protons

Tags

NGSS.MS-PS1-1

FIND THE ELECTRONIC CONFIGURATION OF Cl (At no = 17)

• 2,8,7
• 2,8,8
• 2,8,6
• 2,8

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What atom matches this electron configuration?

1s²2s²2p⁶3s²

• Calcium

• Magnesium

• Aluminum

• Potassium

Tags

NGSS.HS-PS1-1