How many neutrons are there in `""_(38)^(88)Sr` ?

Options

A. 38
B. 50
C. 126
D. 88

Explanation

To find the number of neutrons in the isotope of strontium represented as `""_(38)^(88)Sr`, we can follow these steps:

### Step 1: Identify the Mass Number and Atomic Number
The given notation `""_(38)^(88)Sr` indicates:
- The mass number (A) is 88.
- The atomic number (Z) is 38.

### Step 2: Understand the Relationship Between Mass Number, Atomic Number, and Neutrons
The mass number (A) is the total number of protons and neutrons in the nucleus of an atom. The atomic number (Z) represents the number of protons in the nucleus. The relationship can be expressed as:
\[ \text{Mass Number (A)} = \text{Atomic Number (Z)} + \text{Number of Neutrons (N)} \]

### Step 3: Rearrange the Formula to Find Neutrons
To find the number of neutrons (N), we can rearrange the formula:
\[ N = A - Z \]

### Step 4: Substitute the Values
Now, substitute the values of A and Z into the equation:
\[ N = 88 - 38 \]

### Step 5: Calculate the Number of Neutrons
Now, perform the calculation:
\[ N = 88 - 38 = 50 \]

### Conclusion
Therefore, the number of neutrons in `""_(38)^(88)Sr` is **50**.

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