What is the mass number for a chlorine atom with 18 neutrons?


The mass number of an atom is the sum of its protons and neutrons. For a chlorine atom, we know:

1. Chlorine has an atomic number of 17, meaning it has 17 protons.
2. Given that there are 18 neutrons in this atom, we can add these together to find the mass number.

\[
\text{Mass number} = \text{protons} + \text{neutrons} = 17 + 18 = 35
\]

Therefore, the mass number for this chlorine atom is **35**.

Would you like more details or have questions?

1. How does the mass number differ from atomic mass?
2. What is the importance of the atomic number for identifying elements?
3. Can isotopes of an element have different chemical properties?
4. How do you determine the number of neutrons in an atom given the mass number?
5. What role do neutrons play in the stability of an atom?

**Tip:** For elements with multiple isotopes, mass number can vary even though the atomic number remains constant.

What is the mass number for a chlorine atom with 18 neutrons?

Find the mass number of a chlorine atom with 18 neutrons by understanding atomic structure and the formula for calculating mass number. This problem covers the core concepts of protons, neutrons, and mass number calculation. Ideal for students in Grades 9-10.

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