Periodic Table : Lesson 4

Periodic Table : Lesson 4

by Mohamad Termizi Nurdin

Poll

Have you watch the clip?

Multiple Choice

The _______ the principal quantum number, the _______the attraction towards nucleus, the _______ the ionization energy

• greater, stronger, lower

• greater, weaker, lower

• greater, weaker, higher

• lower, stronger,

  lower

Multiple Choice

1. The ______the atomic radius, the ________the attraction, the _______the ionisation energy.

• smaller, stonger, higher

• bigger, weaker, higher

Multiple Choice

Across a period, Ionisation energy ____a____

Down a group, ionisation energy ____b_____

• a : increase

  b: decrease

• a : increase

  b: increase

• a : decrease

  b: decrease

Open Ended

Explain why second ionisation energy, IE₂ is higher than first ionisation energy, IE₁

​Trend of IE across period 2 and 3

• ​Basically IE getting higher across period 2 and 3

• ​However , there are some irregularities cases in the trend

• Be and B AND N and O in period 2

• ​Mg and Al AND P and S in period 3

​Irregularities in period 2

​

​Irregularities in period 2

​

​Irregularities period 2

​

​Irregularities period 2

​

​Irregularities in period 3

​

​Irregularities in period 3

​

​Irregularities in period 3

​

​Irregularities period 3

​

​Thank you

Open Ended

Atomic size aluminium is smaller than aluminium. However, IE₁ magnesium higher than IE₁ aluminium. Explain the observation.