Identify the group nad valency of the elements having atomic number 119. Also predict the outermost electronic configuration and write the general formula of its oxide.

Explanation

To solve the question regarding the element with atomic number 119, we will follow these steps:

### Step 1: Identify the Group of the Element
- The element with atomic number 119 is the first element in the eighth period of the periodic table.
- The periodic table has groups that categorize elements based on their properties. The first group of the periodic table is known as the alkali metals.
- Therefore, the group of the element with atomic number 119 is **Group 1** (alkali metals).

### Step 2: Determine the Valency of the Element
- Alkali metals have one electron in their outermost shell (valence shell).
- The valency of an element is determined by the number of electrons it can lose, gain, or share to achieve a stable electronic configuration.
- Since element 119 has one electron in its outermost shell, its valency is **1**.

### Step 3: Predict the Outermost Electronic Configuration
- The electronic configuration of the elements follows a specific order. For element 119, we can refer to the previous noble gas configuration.
- The noble gas preceding element 119 is Radon (Rn), which has an atomic number of 86. The electronic configuration of Radon is [Rn] = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4p⁶ 5s² 5p⁶ 6s² 6p⁶ 7s² 7p⁶.
- Element 119 will have one more electron after Radon, which will be added to the 8s subshell.
- Therefore, the outermost electronic configuration of element 119 is **[Rn] 8s¹**.

### Step 4: Write the General Formula of Its Oxide
- Alkali metals typically form oxides with oxygen. The general formula for the oxides of alkali metals can be derived from their valency.
- Alkali metals (like element 119) have a +1 charge, while oxygen typically has a -2 charge.
- To balance the charges, two alkali metal ions (M⁺) are needed for every one oxide ion (O²⁻).
- Thus, the general formula for the oxide of element 119 will be **M₂O**.

### Summary of the Solution
- **Group:** 1 (alkali metals)
- **Valency:** 1
- **Outermost Electronic Configuration:** [Rn] 8s¹
- **General Formula of Its Oxide:** M₂O