In an atom with atomic no. 29 and mass no. 59,the number of electron is:

Options

A. 59
B. 29
C. 39
D. 30

Explanation

To find the number of electrons in an atom with atomic number 29 and mass number 59, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Atomic Number**: The atomic number (Z) is given as 29. The atomic number represents the number of protons in the nucleus of the atom.

2. **Understand the Relationship Between Protons and Electrons**: In a neutral atom, the number of protons is equal to the number of electrons. This is because the positive charge of the protons balances the negative charge of the electrons.

3. **Determine the Number of Electrons**: Since the atomic number is 29, this means there are 29 protons in the atom. Therefore, the number of electrons is also 29.

4. **Conclusion**: The number of electrons in the atom is 29.

### Final Answer:
The number of electrons in the atom is **29**.

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