Question

1. practice: turn off show electron dot diagram. use the gizmo to create a neutral atom of each of the following elements. draw an electron dot diagram for each. when you are finished, turn on show electron dot diagram and check your answers. h he li be b c n o f ne na mg al si

Explanation:

Step1: Recall electron - dot diagram rules

Electron - dot diagrams show the valence electrons of an atom as dots around the chemical symbol. The number of valence electrons is determined by the group number of the element in the periodic table (for main - group elements).

Step2: Determine valence electrons for H

Hydrogen (H) is in Group 1, so it has 1 valence electron. The electron - dot diagram is H•.

Step3: Determine valence electrons for He

Helium (He) is in Group 18. It has 2 valence electrons. The electron - dot diagram is :He:.

Step4: Determine valence electrons for Li

Lithium (Li) is in Group 1, so it has 1 valence electron. The electron - dot diagram is Li•.

Step5: Determine valence electrons for Be

Beryllium (Be) is in Group 2, so it has 2 valence electrons. The electron - dot diagram is :Be:.

Step6: Determine valence electrons for B

Boron (B) is in Group 13, so it has 3 valence electrons. The electron - dot diagram is •B•
•

Step7: Determine valence electrons for C

Carbon (C) is in Group 14, so it has 4 valence electrons. The electron - dot diagram is •C•
•
•

Step8: Determine valence electrons for N

Nitrogen (N) is in Group 15, so it has 5 valence electrons. The electron - dot diagram is •N•
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Step9: Determine valence electrons for O

Oxygen (O) is in Group 16, so it has 6 valence electrons. The electron - dot diagram is :O•
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Step10: Determine valence electrons for F

Fluorine (F) is in Group 17, so it has 7 valence electrons. The electron - dot diagram is :F•
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Step11: Determine valence electrons for Ne

Neon (Ne) is in Group 18, so it has 8 valence electrons. The electron - dot diagram is :Ne:.

Step12: Determine valence electrons for Na

Sodium (Na) is in Group 1, so it has 1 valence electron. The electron - dot diagram is Na•.

Step13: Determine valence electrons for Mg

Magnesium (Mg) is in Group 2, so it has 2 valence electrons. The electron - dot diagram is :Mg:.

Step14: Determine valence electrons for Al

Aluminum (Al) is in Group 13, so it has 3 valence electrons. The electron - dot diagram is •Al•
•

Step15: Determine valence electrons for Si

Silicon (Si) is in Group 14, so it has 4 valence electrons. The electron - dot diagram is •Si•
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Answer:

H: H•; He: :He:; Li: Li•; Be: :Be:; B: •B•
•; C: •C•
•
•; N: •N•
•
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•; O: :O•
•
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•; F: :F•
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•; Ne: :Ne:; Na: Na•; Mg: :Mg:; Al: •Al•
•; Si: •Si•
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•