Question

a. two valence electrons in the fourth energy level, element = ________
b. six valence electrons in the second energy level, element = ________

1. write the name of the element, number of valence electrons, and group number for each main - group element:

symbol	element name	# of valence electrons	group
s
ba
p
ge
f
al
kr

Explanation:

Step1: Identify element for 2 valence in 4th level

Elements in the s - block have valence electrons equal to the group number within the s - block. For 2 valence electrons in the fourth energy level, the element is calcium (Ca) as it has an electron configuration ending in 4s².

Step2: Identify element for 6 valence in 2nd level

Elements in the p - block have valence electrons related to their group number. For 6 valence electrons in the second energy level, the element is oxygen (O) with an electron configuration ending in 2s²2p⁴.

Step3: Fill in table for Li

Lithium (Li) has 1 valence electron and is in Group 1.

Step4: Fill in table for S

Sulfur (S) has 6 valence electrons and is in Group 16.

Step5: Fill in table for Ba

Barium (Ba) has 2 valence electrons and is in Group 2.

Step6: Fill in table for P

Phosphorus (P) has 5 valence electrons and is in Group 15.

Step7: Fill in table for Ge

Germanium (Ge) has 4 valence electrons and is in Group 14.

Step8: Fill in table for F

Fluorine (F) has 7 valence electrons and is in Group 17.

Step9: Fill in table for Al

Aluminum (Al) has 3 valence electrons and is in Group 13.

Step10: Fill in table for Kr

Krypton (Kr) has 8 valence electrons and is in Group 18.

Answer:

a. Element: Calcium
b. Element: Oxygen

Symbol	Element Name	# of Valence Electrons	Group
S	Sulfur	6	16
Ba	Barium	2	2
P	Phosphorus	5	15
Ge	Germanium	4	14
F	Fluorine	7	17
Al	Aluminum	3	13
Kr	Krypton	8	18