Question

electron configuration worksheet how many electrons does each of the following elements/ions contain? 1. o __ 2. o⁻² 3. na 4. na⁺¹ 5. ne 6. al 7. p 8. ar 9. k⁺¹ 10. fe __

Explanation:

To determine the number of electrons in each element/ion, we use the following rules:

• For a neutral atom, the number of electrons equals the atomic number (number of protons).
• For an ion:
• A negative ion (anion) has gained electrons, so electrons = atomic number + charge magnitude.
• A positive ion (cation) has lost electrons, so electrons = atomic number - charge magnitude.

5. Ne (Neon)

Neon is a neutral atom. The atomic number of Ne is 10.
Thus, electrons = atomic number = 10.

6. Al (Aluminum)

Aluminum is a neutral atom. The atomic number of Al is 13.
Thus, electrons = atomic number = 13.

7. P (Phosphorus)

Phosphorus is a neutral atom. The atomic number of P is 15.
Thus, electrons = atomic number = 15.

8. Ar (Argon)

Argon is a neutral atom. The atomic number of Ar is 18.
Thus, electrons = atomic number = 18.

9. \( \text{K}^{+1} \) (Potassium ion)

Potassium (K) has an atomic number of 19. As a \( +1 \) cation, it has lost 1 electron.
Electrons = \( 19 - 1 = 18 \).

10. Fe (Iron)

Iron is a neutral atom. The atomic number of Fe is 26.
Thus, electrons = atomic number = 26.

Final Answers:

1. \( \boldsymbol{10} \)
2. \( \boldsymbol{13} \)
3. \( \boldsymbol{15} \)
4. \( \boldsymbol{18} \)
5. \( \boldsymbol{18} \)
6. \( \boldsymbol{26} \)

Answer:

To determine the number of electrons in each element/ion, we use the following rules:

• For a neutral atom, the number of electrons equals the atomic number (number of protons).
• For an ion:
• A negative ion (anion) has gained electrons, so electrons = atomic number + charge magnitude.
• A positive ion (cation) has lost electrons, so electrons = atomic number - charge magnitude.

5. Ne (Neon)

Neon is a neutral atom. The atomic number of Ne is 10.
Thus, electrons = atomic number = 10.

6. Al (Aluminum)

Aluminum is a neutral atom. The atomic number of Al is 13.
Thus, electrons = atomic number = 13.

7. P (Phosphorus)

Phosphorus is a neutral atom. The atomic number of P is 15.
Thus, electrons = atomic number = 15.

8. Ar (Argon)

Argon is a neutral atom. The atomic number of Ar is 18.
Thus, electrons = atomic number = 18.

9. \( \text{K}^{+1} \) (Potassium ion)

Potassium (K) has an atomic number of 19. As a \( +1 \) cation, it has lost 1 electron.
Electrons = \( 19 - 1 = 18 \).

10. Fe (Iron)

Iron is a neutral atom. The atomic number of Fe is 26.
Thus, electrons = atomic number = 26.

Final Answers:

1. \( \boldsymbol{10} \)
2. \( \boldsymbol{13} \)
3. \( \boldsymbol{15} \)
4. \( \boldsymbol{18} \)
5. \( \boldsymbol{18} \)
6. \( \boldsymbol{26} \)