Unit 3

Question 1

Atomic Radii going down a group

Answer 1

• Increases
• Electrons added to successive energy levels
• Shielding Effect

Question 2

Shielding Effect

Answer 2

Interference of inner electrons to outer ones

Question 3

Atomic radii across periods

Answer 3

• Decreases

* As one goes across a period, each element has an additional proton in nucleus that pulls the electrons closer

Question 4

Which is more significant?

Going down groups, or across periods?

Answer 4

Going down groups

Question 5

Ionization energy going down a group

Answer 5

• Decreases

* Energy is applied against the pull of the nucleus

Question 6

Ionization energy across periods

Answer 6

*Increases

Question 7

What is special about Hydrogen ionization energy?

Answer 7

No shielding effect

Question 8

What is group IA?

Answer 8

Alkali metals

Question 9

What is the ionic charge for Alkali metals?

Answer 9

+1

Question 10

What is group IIA?

Answer 10

Alkaline Earth Metals

Question 11

What is the ionic charge for Alkaline Earth metals?

Answer 11

+2

Question 12

What groups have soft metals?

Answer 12

• Alkali & Alkaline Earth Metals

* Groups IA and IIA

Question 13

What is group VIIA?

Answer 13

Halogens

Halides-ion form

Question 14

What is group VIIIA?

Answer 14

• Nobel gases
• Rare gases
• Inert gases
• Group O

Question 15

Why is sodium a very active metal?

Answer 15

*High ionization energy

Question 16

If the size of a fluorine atom is compared to the size of the fluoride atom…….

Answer 16

*The ion is larger than the atom

Question 17

An atom of fluorine is smaller than an atom of oxygen. One possible explanation is that, compared to oxygen, fluorine has….

Answer 17

*A greater nuclear charge