Atomic Radius and Electronegativity

Periodic Trends

Grade 9

Objectives

• Define atomic radius, ionic radius, ionization energy and electronegativity

• Compare the periodic trends of atomic radii, ionization energy and electronegativity and state the reasons for these variations

Open Ended

Let's see what you know about the lesson ! Write and Share your ideas.

Multiple Choice

The atom with the largest atomic radius in Group 18 is:

• Ar

• He

• Kr

• Rn

Multiple Choice

Which of these has the larger atomic radius?

• N-3

• N

• N-1

Multiple Choice

when atom gain an electron (negative) the size of atom

• Increase

• Decrease

• No change

• Small

Multiple Choice

Which element has the greater ionization energy?

• Lead
• Silicon

Multiple Choice

Put the following in order of increasing ionization energy:Neon, Lithium, Carbon

• Lithium, Carbon, Neon
• Carbon, Lithium, Neon
• Neon, Carbon, Lithium
• Lithium, Neon, Carbon

Open Ended

Can you define electronegativity after seeing this pic ?

Multiple Choice

Which element has a lower electronegativity value?

• Calcium

• Barium

Multiple Choice

Put these in increasing order:
F, N, B

• B < N < F
• B < F < N
• N < F < B
• F < N < B

Poll

Now after the lesson has finished, how confident do you feel about the objectives discussed today.

• I completely understood the lesson

• I could use a bit more practice

• I did not understand at all