Consider an element `""_(15^(31)X` and answer the following questions
How many electrons are there in its valence shell?

Explanation

To determine how many electrons are in the valence shell of the element \( _{15}^{31}X \), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Atomic Number**: The atomic number of the element \( X \) is 15 (as indicated by the subscript). This means it has 15 protons and, in a neutral atom, also 15 electrons.

2. **Determine the Electronic Configuration**: We need to find the electronic configuration of the element with 15 electrons. The distribution of electrons in the shells is as follows:
- The first shell (K) can hold a maximum of 2 electrons.
...