- Hydrogen (H): 1 electron in the first shell.
- Helium (He): 2 electrons in the first shell.
- Lithium (Li): 2 electrons in the first shell, 1 electron in the second shell.
- Beryllium (Be): 2 electrons in the first shell, 2 electrons in the second shell.
- Boron (B): 2 electrons in the first shell, 3 electrons in the second shell.
- Carbon (C): 2 electrons in the first shell, 4 electrons in the second shell.
- Nitrogen (N): 2 electrons in the first shell, 5 electrons in the second shell.
- Oxygen (O): 2 electrons in the first shell, 6 electrons in the second shell.
- Fluorine (F): 2 electrons in the first shell, 7 electrons in the second shell.
- Neon (Ne): 2 electrons in the first shell, 8 electrons in the second shell.
- Sodium (Na): 2 electrons in the first shell, 8 electrons in the second shell, 1 electron in the third shell.
- Magnesium (Mg): 2 electrons in the first shell, 8 electrons in the second shell, 2 electrons in the third shell.
- Aluminum (Al): 2 electrons in the first shell, 8 electrons in the second shell, 3 electrons in the third shell.
- Silicon (Si): 2 electrons in the first shell, 8 electrons in the second shell, 4 electrons in the third shell.
- Phosphorus (P): 2 electrons in the first shell, 8 electrons in the second shell, 5 electrons in the third shell.
- Sulfur (S): 2 electrons in the first shell, 8 electrons in the second shell, 6 electrons in the third shell.
- Chlorine (Cl): 2 electrons in the first shell, 8 electrons in the second shell, 7 electrons in the third shell.
- Argon (Ar): 2 electrons in the first shell, 8 electrons in the second shell, 8 electrons in the third shell.
- Potassium (K): 2 electrons in the first shell, 8 electrons in the second shell, 8 electrons in the third shell, 1 electron in the fourth shell.
- Calcium (Ca): 2 electrons in the first shell, 8 electrons in the second shell, 8 electrons in the third shell, 2 electrons in the fourth shell.
Parent Tip: Review the logic above to help your child master the concept of printable periodic table first 20 elements.
