Unit 3 - Major 10/24 & 10/25

An electron occupies the lowest energy orbital that can receive it.

• Hund’s rule
• Pauli exclusion principle
• Bohr model of the atom
• Aufbau principle

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

• Aufbau principle
• Pauli exclusion principle
• Hund’s rule
• Core Notation

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

• Aufbau principle
• Pauli exclusion principle
• Hund’s rule
• Noble gas notation

Which element is pictured?

• neon
• fluorine
• magnesium
• argon

Tags

NGSS.HS-PS1-1

What is incorrect about this orbital diagram?

• Both arrows in the 2p box should be pointing up
• There is nothing incorrect with this diagram
• In the 2p box there should only be 1 electron in the first 2p box and one in the 2nd 2p box
• All the arrows should be pointing up.

Tags

NGSS.HS-PS1-1

This orbital diagram represents:  

• C
• B
• N
• O

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the Aufbau principle?

• Within an energy level, s orbitals are the lowest energy, followed by p, d and then f. F orbitals are the highest energy for that level.

• The lower the principal quantum number (n) the lower the energy.

• All three.

• The Aufbau Principle states that electrons enter the lowest energy orbitals first.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In 1s², the 1 means

• there is 1 electron

• the electrons are in the 1st energy level

• the shape is circular

• there is a -1 charge

Tags

NGSS.HS-PS1-1

In 1s², the 2 means

• there are 2 electrons in this level

• it is the 2nd energy level

• there is a +2 charge

• there is a -2 charge

What is the valency of Calcium (Ca)

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2