Answer:
Cations are ions with a positive charge, formed when an atom loses electrons. Since you're looking for cations with 20 electrons, let's consider a few examples:
1. **Potassium Cation (K+)**:
- Atomic Number: 19
- Electrons in Neutral Atom: 19
- Electrons in Cation (K+): 19 - 1 = 18
- Chemical Symbol: K+
2. **Calcium Cation (Ca2+)**:
- Atomic Number: 20
- Electrons in Neutral Atom: 20
- Electrons in Cation (Ca2+): 20 - 2 = 18
- Chemical Symbol: Ca2+
3. **Scandium Cation (Sc3+)**:
- Atomic Number: 21
- Electrons in Neutral Atom: 21
- Electrons in Cation (Sc3+): 21 - 3 = 18
- Chemical Symbol: Sc3+
Each of these cations has 20 electrons in its outermost electron configuration. Keep in mind that the number of electrons lost by the neutral atom determines the charge of the cation.
Step-by-step explanation: