How many valence electrons does cesium (Cs) have?

• A. 7
• B. 1
• C. 2
• D. 8

Answer: (B)

Verified step by step guidance

1. Identify the element cesium (Cs) on the periodic table. Cesium is an alkali metal located in Group 1.
2. Recall that the group number for main-group elements indicates the number of valence electrons. For Group 1 elements, there is 1 valence electron.
3. Understand that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
4. Confirm that cesium, being in Group 1, has a single electron in its outermost shell, which means it has 1 valence electron.
5. Therefore, the number of valence electrons in cesium (Cs) is 1.