The Periodic Table

Question 1

Period

Answer 1

• Horizontal rows, give the principle quantum number

Question 2

Group

Answer 2

• Vertical column
• Gives the e- configuration of the valence
• Groups have similar chemical reactivities

Question 3

Why do elements seek to gain or lose e-?

Answer 3

To achieve a stable octet like the noble gases

Question 4

Atomic Radii

Answer 4

Decreases left to right

• Effective nuclear charge increases as protons are added
• e- stay in the same shell, so they are puled in tighter

Increases down groups

• filled e- shells increase
• increased distance from nucleus

Question 5

Ionization Energy

Answer 5

• Energy required to completly remove an e- (1st, 2nd, etc…)
• More tightly bound the e-, more energy required
• More energy required with each e- removed
• Increases left to right, decreases down (opposite of atomic radius)

Question 6

Electron Affinity

Answer 6

• Energy released when an e- is added (how easily an atom accept an e-)
• Positive value when e- is added