Unit 8- The periodic table

Question 1

e- config of anions

Answer 1

• additional e- fills in the same way as all other e-
• many stable anions have the same e- config as a noble gas

Question 2

e- config of cations

Answer 2

e- of HIGHEST n value are removed first or from subshell with highest l

Question 3

Isoelectronic series

Answer 3

a group of atoms and ions with the same # of e-

Question 4

atomic radii

Answer 4

1/2 distance between adjacent atoms of the same ele in molec

Question 5

sizes of atoms

Answer 5

• loss of e- = SMALLER neutral atom (ex: Li+)
• gain of e- = LARGER neutral atom (ex: Li-)
• inc right and down

Question 6

ionization energy (I)

Answer 6

energy required to remove an e- from a gaseous atom or ion in its e- ground state
- as as many ionization energies as it has e-
(ex: Mg —> Mg+ + e-)
- incs with removal of e-
(more energy needed to remove core e- over ve-)

• inc left and up

Question 7

ionization energy in isoe- series

Answer 7

More PROTONS = higher ionization energy

Question 8

Electron Affinity

Answer 8

the energy change that accompanies the addition of an e- to a gaseous atom to form n anion
- exothermic
- inc left and up

Question 9

Alkali Metals- Group 1A

Answer 9

• reactivity incs down the group
• dominated by M+ ions

Question 10

Alkaline Earth Metals- group 2A

Answer 10

• not as reactive as group 1A
• reactivity increases down the group
• from M2+ ions

Question 11

Halogens- group 7A

Answer 11

• exist as diamotics, but are very reactive
• reactivity decreases down the group
• from X- ions
• interhalogens are formed from diff halogens like IF3 and BrCl