Question

valence electrons and dot diagrams
1 how many valance electron do each of the following have?
i li _ ii p _ iii s _ iv as _ v c _ vi k _
vii se _ viii in _ ix sr _ x ca _ xi o _ xii na _
2 fill in the blanks.
dot diagrams represent the number of __________________ for an
atom. they consist of the __________ of the element which represents
the ______ of the atom and ______ represents the valence electrons.

Explanation:

Step1: Determine valence electrons using periodic table group numbers

• For main - group elements (groups 1 - 2 and 13 - 18), the number of valence electrons is equal to the group number (for groups 1 - 2, it's straightforward; for groups 13 - 18, subtract 10).
• Li (Lithium): Group 1. So, it has 1 valence electron.
• P (Phosphorus): Group 15. \(15 - 10=5\) valence electrons.
• S (Sulfur): Group 16. \(16 - 10 = 6\) valence electrons.
• As (Arsenic): Group 15. \(15 - 10=5\) valence electrons.
• C (Carbon): Group 14. \(14 - 10 = 4\) valence electrons.
• K (Potassium): Group 1. 1 valence electron.
• Se (Selenium): Group 16. \(16 - 10=6\) valence electrons.
• In (Indium): Group 13. \(13 - 10 = 3\) valence electrons.
• Sr (Strontium): Group 2. 2 valence electrons.
• Ca (Calcium): Group 2. 2 valence electrons.
• O (Oxygen): Group 16. \(16 - 10=6\) valence electrons.
• Na (Sodium): Group 1. 1 valence electron.

Step2: Fill in the dot - diagram blanks

• Dot Diagrams represent the number of valence electrons for an atom. They consist of the symbol of the element which represents the nucleus and inner - shell electrons of the atom and dots that represents the valence electrons.

Answer:

1.
I. \(1\)
II. \(5\)
III. \(6\)
IV. \(5\)
V. \(4\)
VI. \(1\)
VII. \(6\)
VIII. \(3\)
IX. \(2\)
X. \(2\)
XI. \(6\)
XII. \(1\)
2.
Dot Diagrams represent the number of valence electrons for an atom. They consist of the symbol of the element which represents the nucleus and inner - shell electrons of the atom and dots that represents the valence electrons.