Question

The element with Z = 120(not yet discovred) will be an/a

• A. Inner transition metal
• B. Alkaline earth metal
• C. Alkali metal
• D. Transition metal

Answer 1

Answer: (B)

B

Answer 2

To determine the nature of the element with Z = 120, we need to predict its electronic configuration and locate its position in the periodic table.

1. Identify the preceding noble gas: The last noble gas is Oganesson (Og) with atomic number Z = 118.
2. Determine the period: Since Oganesson (Z=118) completes Period 7, the element with Z = 120 will be in Period 8.
3. Predict the electronic configuration: After Oganesson (Z=118), the next electrons will start filling the 8s orbital.
   • For Z = 119, the configuration would be [Og] 8s¹.
   • For Z = 120, the configuration would be [Og] 8s².
4. Classify the element: Elements with an outer electronic configuration of ns² belong to Group 2 of the periodic table, which are known as alkaline earth metals.

Therefore, the element with Z = 120 will be an alkaline earth metal.