Nucleus of an atom contains 5 protons and 6 neutrons .The valency of element will be

Options

A. 1
B. 5
C. 3
D. 2

Answer

To determine the valency of the element with 5 protons and 6 neutrons, we can follow these steps:

### Step 1: Identify the Atomic Number
The atomic number (Z) of an element is equal to the number of protons in its nucleus. Given that the nucleus contains 5 protons, we can conclude that:
- **Atomic Number (Z) = 5**

### Step 2: Determine the Element
Using the periodic table, we can identify the element with atomic number 5. The element with atomic number 5 is:
- **Boron (B)**

### Step 3: Write the Electronic Configuration
Next, we need to determine the electronic configuration of Boron. The atomic number tells us the number of electrons in a neutral atom, which is also 5. The electronic configuration can be written as follows:
- **Electronic Configuration of Boron: 1s² 2s² 2p¹**

### Step 4: Determine the Valency
Valency is determined by the number of electrons in the outermost shell (valence shell) that can be gained, lost, or shared to achieve a full outer shell. For Boron:
- The outermost shell (2nd shell) has a total of 3 electrons (2 in 2s and 1 in 2p).
- Boron can either lose 3 electrons to achieve a stable configuration (like Neon) or gain 5 electrons to fill its outer shell. However, it typically tends to lose 3 electrons.

Thus, the valency of Boron is:
- **Valency = 3**

### Final Answer:
The valency of the element is **3**.

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