Question

fill in the blanks. you do not need a copy of the periodic table. use what you know about periods and groups!a analysis: hands-on p. table struct. & logic last _____ first _____ copyright © bossey broadmain-group elementsperiodic table modelgroup →1a 2a aka 12 3a aka 13 4a aka 14 5a aka 15 6a aka 16 7a aka 17 8a/0 aka 18

Explanation:

Step1: Define key rules

1. Atomic number = number of protons = total electrons (neutral atoms)
2. Energy shells = period number (row number)
3. Valence electrons = group number (for main groups: 1A=1, 2A=2, 3A=3, 4A=4, 5A=5, 6A=6, 7A=7, 8A=8)

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Row 1 (Period 1, Energy Shells=1)

Step2: Fill Hydrogen (H)

Protons = 1, Total Electrons = 1, Valence Electrons = 1

Step3: Fill Helium (He)

Protons = 2, Total Electrons = 2, Valence Electrons = 2 (special case for 8A, period 1)

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Row 2 (Period 2, Energy Shells=2)

Step4: Fill Lithium (Li, Group 1A)

Protons = 3, Total Electrons = 3, Valence Electrons = 1

Step5: Fill Beryllium (Be, Group 2A)

Protons = 4, Total Electrons = 4, Valence Electrons = 2

Step6: Fill Boron (B, Group 3A)

Protons = 5, Total Electrons = 5, Valence Electrons = 3

Step7: Fill Carbon (C, Group 4A)

Protons = 6, Total Electrons = 6, Valence Electrons = 4

Step8: Fill Nitrogen (N, Group 5A)

Protons = 7, Total Electrons = 7, Valence Electrons = 5

Step9: Fill Oxygen (O, Group 6A)

Protons = 8, Total Electrons = 8, Valence Electrons = 6

Step10: Fill Fluorine (F, Group 7A)

Protons = 9, Total Electrons = 9, Valence Electrons = 7

Step11: Fill Neon (Ne, Group 8A)

Protons = 10, Total Electrons = 10, Valence Electrons = 8

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Row 3 (Period 3, Energy Shells=3)

Step12: Fill Sodium (Na, Group 1A)

Protons = 11, Total Electrons = 11, Valence Electrons = 1

Step13: Fill Magnesium (Mg, Group 2A)

Protons = 12, Total Electrons = 12, Valence Electrons = 2

Step14: Fill Aluminum (Al, Group 3A)

Protons = 13, Total Electrons = 13, Valence Electrons = 3

Step15: Fill Silicon (Si, Group 4A)

Protons = 14, Total Electrons = 14, Valence Electrons = 4

Step16: Fill Phosphorus (P, Group 5A)

Protons = 15, Total Electrons = 15, Valence Electrons = 5

Step17: Fill Sulfur (S, Group 6A)

Protons = 16, Total Electrons = 16, Valence Electrons = 6

Step18: Fill Chlorine (Cl, Group 7A)

Protons = 17, Total Electrons = 17, Valence Electrons = 7

Step19: Fill Argon (Ar, Group 8A)

Protons = 18, Total Electrons = 18, Valence Electrons = 8

Answer:

Row 1 (Period 1)

Property	H	He
Total Electrons	1	2
Valence Electrons	1	2
Energy Shells	1	1

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Row 2 (Period 2)

Property	Li	Be	B	C	N	O	F	Ne
Total Electrons	3	4	5	6	7	8	9	10
Valence Electrons	1	2	3	4	5	6	7	8
Energy Shells	2	2	2	2	2	2	2	2

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Row 3 (Period 3)

Property	Na	Mg	Al	Si	P	S	Cl	Ar
Total Electrons	11	12	13	14	15	16	17	18
Valence Electrons	1	2	3	4	5	6	7	8
Energy Shells	3	3	3	3	3	3	3	3