Unit 3 Flashcards
(17 cards)
Atomic Radii going down a group
- Increases
- Electrons added to successive energy levels
- Shielding Effect
Shielding Effect
Interference of inner electrons to outer ones
Atomic radii across periods
- Decreases
* As one goes across a period, each element has an additional proton in nucleus that pulls the electrons closer
Which is more significant?
Going down groups, or across periods?
Going down groups
Ionization energy going down a group
- Decreases
* Energy is applied against the pull of the nucleus
Ionization energy across periods
*Increases
What is special about Hydrogen ionization energy?
No shielding effect
What is group IA?
Alkali metals
What is the ionic charge for Alkali metals?
+1
What is group IIA?
Alkaline Earth Metals
What is the ionic charge for Alkaline Earth metals?
+2
What groups have soft metals?
- Alkali & Alkaline Earth Metals
* Groups IA and IIA
What is group VIIA?
Halogens
Halides-ion form
What is group VIIIA?
- Nobel gases
- Rare gases
- Inert gases
- Group O
Why is sodium a very active metal?
*High ionization energy
If the size of a fluorine atom is compared to the size of the fluoride atom…….
*The ion is larger than the atom
An atom of fluorine is smaller than an atom of oxygen. One possible explanation is that, compared to oxygen, fluorine has….
*A greater nuclear charge
