Understanding the number of valence electrons in an atom is crucial for predicting its chemical behavior. Here’s a breakdown for each of the specified atoms:
- Cesium (Cs) – Atomic Number 55: Cesium has 1 valence electron. This is because it is in Group 1 of the periodic table, which means it has one electron in its outermost shell.
- Krypton (Kr) – Atomic Number 36: Krypton has 8 valence electrons. As a noble gas in Group 18, it has a full outer shell, making it chemically inert.
- Boron (B) – Atomic Number 5: Boron has 3 valence electrons. It is located in Group 13, which means it has three electrons in its outermost shell.
- Magnesium (Mg) – Atomic Number 12: Magnesium has 2 valence electrons. Being in Group 2, it has two electrons in its outermost shell.
These valence electrons play a significant role in the formation of chemical bonds and the reactivity of the elements.