Question

1. in what family would each of these elements be classified? radium - iodine - cesium - thallium - 9. predict the number of valence electrons for each element based on its group in the periodic table. you will need to use the table in your textbook. barium = lead = bismuth =

Explanation:

Step1: Recall periodic - table families

Elements in the same group have similar properties and the same number of valence electrons.

Step2: Identify families and valence - electron numbers

• Radium: Radium is in Group 2 (alkaline - earth metals). Alkaline - earth metals have 2 valence electrons.
• Iodine: Iodine is in Group 17 (halogens). Halogens have 7 valence electrons.
• Cesium: Cesium is in Group 1 (alkali metals). Alkali metals have 1 valence electron.
• Barium: Barium is in Group 2 (alkaline - earth metals), so it has 2 valence electrons.
• Lead: Lead is in Group 14, and it has 4 valence electrons.
• Bismuth: Bismuth is in Group 15, and it has 5 valence electrons.

Answer:

Radium - 2, Iodine - 7, Cesium - 1, Barium - 2, Lead - 4, Bismuth - 5