The sum of the number of neutrons and protons in the isotopes of hydrogen is :

Options

A. 6
B. 5
C. 4
D. 3

Explanation

To solve the question about the sum of the number of neutrons and protons in the isotopes of hydrogen, we can follow these steps:

### Step 1: Identify the isotopes of hydrogen
Hydrogen has three isotopes:
1. Protium (¹H₁)
2. Deuterium (¹H₂)
3. Tritium (¹H₃)

### Step 2: Determine the number of protons in each isotope
The number of protons in an element is equal to its atomic number. For hydrogen, the atomic number is 1. Therefore, the number of protons in each isotope is:
- Protium: 1 proton
- Deuterium: 1 proton
- Tritium: 1 proton

### Step 3: Calculate the number of neutrons in each isotope
The number of neutrons can be calculated using the formula:
\[ \text{Number of Neutrons} = \text{Mass Number} - \text{Atomic Number} \]

- For Protium (¹H₁):
- Mass Number = 1
- Neutrons = 1 - 1 = 0

- For Deuterium (¹H₂):
- Mass Number = 2
- Neutrons = 2 - 1 = 1

- For Tritium (¹H₃):
- Mass Number = 3
- Neutrons = 3 - 1 = 2

### Step 4: Sum the number of protons and neutrons for each isotope
Now, we will add the number of protons and neutrons for each isotope:
- Protium: 1 proton + 0 neutrons = 1
- Deuterium: 1 proton + 1 neutron = 2
- Tritium: 1 proton + 2 neutrons = 3

### Step 5: Calculate the total sum of protons and neutrons from all isotopes
Now, we will add the results from each isotope:
\[ \text{Total} = 1 + 2 + 3 = 6 \]

### Final Answer
The sum of the number of neutrons and protons in the isotopes of hydrogen is 6.

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