Information about two atoms, X and Y are shown below `:`
`{:("Atom","Nucleon number","Proton number"),(X,14,7),(Y,15,7):}`
Which of the following is correct about these two atoms?

Options

A. Electronic configuration `:` `{:("Atom X","Atom Y"),("2,8,4","2,8,5"):}`
B. Number of neutrons `:` `{:("Atom X","Atom Y"),(7,7):}`
C. Number of valence electrons `:` `{:("Atom X","Atom Y"),(5,5):}`
D. Number of electron shells `:` `{:("Atom X","Atom Y"),(2,3):}`

Explanation

To solve the question regarding the two atoms X and Y, we will analyze the provided information step by step.

### Step 1: Understand the given data
We have two atoms with the following information:
- Atom X: Nucleon number (mass number) = 14, Proton number (atomic number) = 7
- Atom Y: Nucleon number (mass number) = 15, Proton number (atomic number) = 7

### Step 2: Identify the elements
The proton number (atomic number) indicates the element. Since both atoms have a proton number of 7, they are both nitrogen atoms (N).

### Step 3: Calculate the number of neutrons
To find the number of neutrons in each atom, we use the formula:
\[ \text{Number of Neutrons} = \text{Nucleon Number} - \text{Proton Number} \]

For Atom X:
- Nucleon number = 14
- Proton number = 7
\[ \text{Number of Neutrons in X} = 14 - 7 = 7 \]

For Atom Y:
- Nucleon number = 15
- Proton number = 7
\[ \text{Number of Neutrons in Y} = 15 - 7 = 8 \]

### Step 4: Determine the electronic configuration
The electronic configuration can be determined based on the number of electrons, which equals the number of protons for neutral atoms.

For Atom X (7 electrons):
- 2 electrons in the first shell
- 5 electrons in the second shell
Thus, the electronic configuration of X is \( 2, 5 \).

For Atom Y (7 electrons):
- 2 electrons in the first shell
- 5 electrons in the second shell
Thus, the electronic configuration of Y is also \( 2, 5 \).

### Step 5: Identify the number of valence electrons
Valence electrons are the electrons in the outermost shell. For both atoms X and Y, the outermost shell has 5 electrons.

### Step 6: Determine the number of electron shells
Both atoms have 2 electron shells:
- First shell: 2 electrons
- Second shell: 5 electrons

### Conclusion
Based on the analysis:
- Both atoms X and Y have the same number of valence electrons (5).
- Both atoms have the same number of electron shells (2).
- The number of neutrons differs (7 for X and 8 for Y).

Thus, the correct statement about these two atoms is that they have the same number of valence electrons.

### Final Answer
The correct option is that both atoms X and Y have the same number of valence electrons.