Chemistry Lesson: Electron Dot Notation Quiz

1. How many valence electrons does He have?

2

3

4

5

Helium (HeHe) has 2 valence electrons. These two electrons fill its only energy level (1s orbital), giving helium a stable and complete outer shell. Therefore, helium is chemically inert and considered a noble gas.

Explanation

Helium (HeHe) has 2 valence electrons. These two electrons fill its only energy level (1s orbital), giving helium a stable and complete outer shell. Therefore, helium is chemically inert and considered a noble gas.

2. How many valence electrons does Cl have?

4

2

7

8

Chlorine (Cl), an element in Group 17 of the periodic table, has seven valence electrons. With an atomic number of 17, its electron configuration is 1s²2s²2p⁶3s²3p⁵, meaning the outermost third shell contains seven electrons, making them its valence electrons.

Explanation

Chlorine (Cl), an element in Group 17 of the periodic table, has seven valence electrons. With an atomic number of 17, its electron configuration is 1s²2s²2p⁶3s²3p⁵, meaning the outermost third shell contains seven electrons, making them its valence electrons.

3. How many valence electrons does F have?

4

5

6

7

Fluorine (F), with an atomic number of 9, has 7 valence electrons. Its electron configuration is 1s²2s²2p⁵. The 7 valence electrons are located in the second energy level (2s and 2p orbitals).

Explanation

Fluorine (F), with an atomic number of 9, has 7 valence electrons. Its electron configuration is 1s²2s²2p⁵. The 7 valence electrons are located in the second energy level (2s and 2p orbitals).

4. How many valence electrons does Ne have?

4

6

8

10

Neon (Ne), with an atomic number of 10, has 8 valence electrons. Its electron configuration is 1s²2s²2p⁶. The 8 valence electrons fill the second energy level (2s and 2p orbitals), giving neon a stable, complete outer shell.

Explanation

Neon (Ne), with an atomic number of 10, has 8 valence electrons. Its electron configuration is 1s²2s²2p⁶. The 8 valence electrons fill the second energy level (2s and 2p orbitals), giving neon a stable, complete outer shell.

5. How many valence electrons does P have?

4

5

6

15

Phosphorus (P), an element in Group 15 of the periodic table, has five valence electrons. With an atomic number of 15, its electron configuration is 1s²2s²2p⁶3s²3p³, meaning the outermost third shell contains five electrons, making them its valence electrons.

Explanation

Phosphorus (P), an element in Group 15 of the periodic table, has five valence electrons. With an atomic number of 15, its electron configuration is 1s²2s²2p⁶3s²3p³, meaning the outermost third shell contains five electrons, making them its valence electrons.

6. How many valence electrons does Mg have?

12

2

3

5

Magnesium (Mg), with an atomic number of 12, has 2 valence electrons. Its electron configuration is 1s²2s²2p⁶3s². The 2 valence electrons are located in the 3s orbital.

Explanation

Magnesium (Mg), with an atomic number of 12, has 2 valence electrons. Its electron configuration is 1s²2s²2p⁶3s². The 2 valence electrons are located in the 3s orbital.

7. How many valence electrons does Ca have?

8

7

3

2

Calcium (Ca), an element in Group 2 of the periodic table, has two valence electrons. With an atomic number of 20, its electron configuration is 1s2²s2²p⁶3s²3p⁶4s², meaning the outermost fourth shell contains two electrons, making them its valence electrons.

Explanation

Calcium (Ca), an element in Group 2 of the periodic table, has two valence electrons. With an atomic number of 20, its electron configuration is 1s2²s2²p⁶3s²3p⁶4s², meaning the outermost fourth shell contains two electrons, making them its valence electrons.

8. How many valence electrons does Al have?

2

13

3

8

Aluminum (Al), with an atomic number of 13, has 3 valence electrons. Its electron configuration is 1s²2s²2p⁶3s²3p¹. The 3 valence electrons are located in the 3s and 3p orbitals.

Explanation

Aluminum (Al), with an atomic number of 13, has 3 valence electrons. Its electron configuration is 1s²2s²2p⁶3s²3p¹. The 3 valence electrons are located in the 3s and 3p orbitals.

9. How many valence electrons does B have?

3

4

5

6

Boron (B), with an atomic number of 5, has 3 valence electrons. Its electron configuration is 1s² 2s² 2p¹. The 3 valence electrons are found in the second energy level (2s and 2p orbitals).

Explanation

Boron (B), with an atomic number of 5, has 3 valence electrons. Its electron configuration is 1s² 2s² 2p¹. The 3 valence electrons are found in the second energy level (2s and 2p orbitals).

10. How many valence electrons does Fe have?

6

8

9

4

Iron (Fe), an element in Group 8 of the periodic table, has eight valence electrons. With an atomic number of 26, its electron configuration is 1s²2s²2p⁶3s²3p⁶3d⁶4s². The valence electrons include the two in the 4s subshell and the six in the 3d subshell, making a total of eight valence electrons.

Explanation

Iron (Fe), an element in Group 8 of the periodic table, has eight valence electrons. With an atomic number of 26, its electron configuration is 1s²2s²2p⁶3s²3p⁶3d⁶4s². The valence electrons include the two in the 4s subshell and the six in the 3d subshell, making a total of eight valence electrons.

Chemistry Lesson: Electron DOT Notation Quiz