Using the periodic table, fill in the chart for each Atom (Round the atomic mass

Question

Using the periodic table, fill in the chart for each Atom (Round the atomic mass to the nearest whole number).

2. Carbon (C)

Atomic # = ______Atomic Mass = _________

# of Protons = ________# of Neutrons = ________# of Electrons = ________

# of Electrons in the valence shell? _____

3. Oxygen (O)

Atomic # = ______Atomic Mass = _________

# of Protons = ________# of Neutrons = ________# of Electrons = ________

# of Electrons in the valence shell? _____

4. Sodium (Na)

Atomic # = ______Atomic Mass = _________

# of Protons = ________# of Neutrons = ________# of Electrons = ________

# of Electrons in the valence shell? _____

5. Chlorine (Cl)

Atomic # = ______Atomic Mass = _________

# of Protons = ________# of Neutrons = ________# of Electrons = ________

# of Electrons in the valence shell? _____

6. Hydrogen (H)

Atomic # = ______Atomic Mass = _________

# of Protons = ________# of Neutrons = ________# of Electrons = ________

# of Electrons in the valence shell? _____

7. Nitrogen (N)

Atomic # = ______Atomic Mass = _________

# of Protons = ______# of Neutrons = ______# of Electrons = ______

# of Electrons in the valence shell? _____

Explanation / Answer

(2) Carbon (C)

Atomic number = 6

Atomic mass = 12

Number of protons = Atomic number =6

Number of neutrons = Atomic mass - Atomic number = 12-6 = 6

Number of electrons = Atomic number = 6

Electronic configuration : 1s22s2 2p2

Number of electrons in the valence shell = 2+2 = 4   ( valence shell is represented by bold letters)

(3) Oxygen (O)

Atomic number = 8

Atomic mass = 16

Number of protons = Atomic number =8

Number of neutrons = Atomic mass - Atomic number = 16-8 = 8

Number of electrons = Atomic number = 8

Electronic configuration : 1s22s2 2p4

Number of electrons in the valence shell = 2+4 = 6 ( valence shell is represented by bold letters)

(4) Sodium (Na)

Atomic number = 11

Atomic mass = 23

Number of protons = Atomic number =11

Number of neutrons = Atomic mass - Atomic number = 23-11 = 12

Number of electrons = Atomic number = 11

Electronic configuration : 1s2 2s2 2p63s1

Number of electrons in the valence shell = 1 ( valence shell is represented by bold letters)

(5) Chlorine (Cl)

Atomic number = 17

Atomic mass = 35

Number of protons = Atomic number =17

Number of neutrons = Atomic mass - Atomic number = 35-17 = 18

Number of electrons = Atomic number = 17

Electronic configuration : 1s2 2s2 2p63s2 3p5

Number of electrons in the valence shell = 2+5 = 7 ( valence shell is represented by bold letters)

(6) Hydrogen (H)

Atomic number = 1

Atomic mass = 1

Number of protons = Atomic number =1

Number of neutrons = Atomic mass - Atomic number = 1-1 = 0

Number of electrons = Atomic number = 1

Electronic configuration : 1s1

Number of electrons in the valence shell = 1 ( valence shell is represented by bold letters)

(7) Nitrogen (N)

Atomic number = 7

Atomic mass = 14

Number of protons = Atomic number =7

Number of neutrons = Atomic mass - Atomic number = 14-7 = 7

Number of electrons = Atomic number = 7

Electronic configuration : 1s22s2 2p3

Number of electrons in the valence shell = 2+3 = 5 ( valence shell is represented by bold letters)

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