1. Do Now
Which list includes elements with the most similar chemical properties?
Br, Ga, Hg
Cr, Pb, Xe
O, S, Se
N, O, F

2. Williamsburg High School for Architecture and Design
Periodicity, Part 1.5
Williamsburg High School for Architecture and Design
Mr. Quinn and Ms. Tom
10/29/13

3. Aim
How is the periodic table organized?

4. Atomic Radius
The distance from the middle of the nucleus to the outermost electron shell

5. Outer Shell Electrons aka Valence Electrons
The total number of electrons on the outer shell
This includes the s- and p-sublevels

6. Ionization Energy
The amount of energy required to remove a valence electron

7. Electron Affinity
The amount of energy gained by adding an electron to the outer shell

8. Electron Affinity As we move across a period, electron affinity…
Increases
As we move down a group, electron affinity…
Stays the same

9. Electron Affinity
As number of valence electrons increases, electron affinity…
Increases
As ionization energy increases, electron affinity…

10. Electronegativity
The total ability of an atom to hold an electron

11. Electronegativity As we move across a period, electronegativity…
Increases
As we move down a group, electronegativity…
Decreases

12. Electronegativity As atomic radius increases, electronegativity…
Decreases
As number of valence electrons increases, electronegativity…
Increases

13. Electronegativity As ionization energy increases, electronegativity…
As electron affinity increases, electronegativity…

14. To Recap… Many valence electrons High Ionization Energy
High electron affinity
High electronegativity
To Recap…
High Atomic Radius

15. Regents Problems, Round 1
The elements on the Periodic Table are arranged in order of increasing
atomic mass
atomic number
molar mass
oxidation number

16. Regents Problems, Round 2
Which list of elements from Group 2 on the Periodic Table is arranged in order of increasing atomic radius?
Be, Mg, Ca
Ca, Mg, Be
Ba, Ra, Sr
Sr, Ra, Ba

17. Regents Problems, Round 3
Which atom in the ground state requires the least amount of energy to remove its valence electron?
lithium atom
potassium atom
rubidium atom
sodium atom

18. Regents Problems, Round 4
Which general trend is found in Period 3 as the elements are considered in order of increasing atomic number?
increasing atomic radius
increasing electronegativity
decreasing atomic mass
decreasing first ionization energy

19. Regents Problems, Round 5
Compared to the atoms of nonmetals in Period 3, the atoms of metals in Period 3 have
fewer valence electrons
more valence electrons
fewer electron shells
more electron shells

20. Regents Problems, Round 6
In the ground state, each atom of an element has two valence electrons. This element has a lower first ionization energy than calcium. Where is this element located on the Periodic Table?
Group 1, Period 4
Group 2, Period 5
Group 2, Period 3
Group 3, Period4

21. Regents Problems, Round 7
An atom of which element has the greatest attraction for the electrons in a bond with a hydrogen atom?
Chlorine
Phosphorus
Silicon
sulfur

22. Regents Problems, Round 8
As the elements is Period 3 are considered in order of increasing atomic number, there is a general decrease in
atomic mass
atomic radius
electronegativity
first ionization energy

23. Regents Problems, Round 9
Which element has chemical properties that are most similar to the chemical properties of sodium?
Beryllium
Calcium
Lithium
magnesium

24. Regents Problems, Round 10
As atomic number increases within Group 15 on the Periodic Table, atomic radius
decreases, only
increases, only
decreases, then increases
increases, then decreases