EXAM PREP SET
◉ what are the halogens? Answer: fluorine, chlorine, bromine,
iodine
◉ what are the transition metals? Answer: They are the D-block
elements and are located in Groups 3 through 12.
◉ how many electrons are in the second energy level of magnesium?
Answer: 8
◉ how many electrons are in the outer energy level of nitrogen?
Answer: 5
◉ how many electrons are in the third energy level of sodium?
Answer: 1
◉ draw the orbital diagram of oxygen Answer: ⬆️⬇️ ⬆️⬇️ ⬆️ ⬆️
-------- -------- -------- --------
2s 2p
, ⬆️⬇️
--------
1s
◉ electron configuration for sulfur Answer: 1s2_2s2_2p6_3s2_3p4
◉ electron configuration for magnesium Answer: 1s2_2s2_2p6_3s2
◉ dot configuration for lead Answer: *
* Pb *
*
◉ dot configuration for krypton Answer: * *
** Kr **
**
◉ dot configuration for Cl Answer: *
** Cl **
**
◉ octet rule Answer: atoms lose, gain, or share valence electrons to
have 8 valence electrons