Question

1. how many valence electrons does magnesium have?

a 1
b 6
c 4
d 2

1. how many valence electrons does f have?

a 7
b 6
c 8
d 5

1. how many valence electrons does cl have?

a 7
b 6
c 8
d 5

1. how many electron shells does c have?

a 1
b 2
c 3
d 4

Explanation:

Step1: Recall magnesium's position

Magnesium (Mg) is in Group 2 of the periodic table. Elements in Group 2 have 2 valence - electrons.

Step2: Recall fluorine's position

Fluorine (F) is in Group 17 of the periodic table. Elements in Group 17 have 7 valence - electrons.

Step3: Recall chlorine's position

Chlorine (Cl) is in Group 17 of the periodic table. Elements in Group 17 have 7 valence - electrons.

Step4: Recall carbon's electron - shell structure

Carbon (C) has an atomic number of 6. Its electron configuration is 1s²2s²2p², which means it has 2 electron shells (n = 1 and n = 2).

Answer:

1. D. 2
2. A. 7
3. A. 7
4. B. 2