The element having 9 protons and 10 neutrons is ………..

Answer

To determine the element with 9 protons and 10 neutrons, we can follow these steps:

### Step 1: Identify the Atomic Number
The atomic number of an element is defined by the number of protons it has. In this case, the element has 9 protons.

### Step 2: Find the Element Corresponding to the Atomic Number
Using the periodic table, we can find that the element with atomic number 9 is Fluorine (F).

### Step 3: Calculate the Mass Number
The mass number of an element is the sum of the number of protons and neutrons. Here, we have:
- Protons = 9
- Neutrons = 10

So, the mass number = Protons + Neutrons = 9 + 10 = 19.

### Step 4: Conclusion
The element with 9 protons and 10 neutrons is Fluorine, which has the symbol F and a mass number of 19.

### Final Answer
The element having 9 protons and 10 neutrons is **Fluorine (F)**.

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