Question

valence electrons
directions: determine how many valence electrons each atom has.
number of valence electrons:
number of valence electrons:
number of valence electrons:
number of valence electrons:
number of valence electrons:
number of valence electrons:
directions: using a periodic table, fill in each blank below to determine how many valence electrons each atom will have.

1. magnesium has ____ valence electrons.
2. he has ____ valence electrons.
3. nitrogen has ____ valence electrons.
4. cl has ____ valence electrons.
5. aluminum has ____ valence electrons.
6. lithium has ____ valence electrons.
7. ge has ____ valence electrons.
8. calcium has ____ valence electrons.
9. rb has ____ valence electrons.
10. selenium has ____ valence electrons.

Explanation:

Step1: Identify valence electrons for Si

Valence electrons are in out - most shell. Si has 4 electrons in outer shell.

Step2: Identify valence electrons for Be

Be has 2 electrons in outer shell.

Step3: Identify valence electrons for B

B has 3 electrons in outer shell.

Step4: Identify valence electrons for F

F has 7 electrons in outer shell.

Step5: Identify valence electrons for Na

Na has 1 electron in outer shell.

Step6: Identify valence electrons for P

P has 5 electrons in outer shell.

Step7: Identify valence electrons for Mg

Mg is in group 2, has 2 valence electrons.

Step8: Identify valence electrons for He

He is a noble gas, has 2 valence electrons.

Step9: Identify valence electrons for N

N is in group 15, has 5 valence electrons.

Step10: Identify valence electrons for Cl

Cl is in group 17, has 7 valence electrons.

Step11: Identify valence electrons for Al

Al is in group 13, has 3 valence electrons.

Step12: Identify valence electrons for Li

Li is in group 1, has 1 valence electron.

Step13: Identify valence electrons for Ge

Ge is in group 14, has 4 valence electrons.

Step14: Identify valence electrons for Ca

Ca is in group 2, has 2 valence electrons.

Step15: Identify valence electrons for Rb

Rb is in group 1, has 1 valence electron.

Step16: Identify valence electrons for Se

Se is in group 16, has 6 valence electrons.

Answer:

Si: 4
Be: 2
B: 3
F: 7
Na: 1
P: 5
Mg: 2
He: 2
N: 5
Cl: 7
Al: 3
Li: 1
Ge: 4
Ca: 2
Rb: 1
Se: 6