Question

How many protons, neutrons, and electrons does a chlorine atom with a mass of 35 contain?
atomic mass=
p +=
e -=
n 0 =

Answer 1

A chlorine atom typically has an atomic number of 17, which means it has 17 protons. In a neutral atom, the number of electrons equals the number of protons, so a neutral chlorine atom also has 17 electrons.

The atomic mass of chlorine is given as approximately 35 (specifically, it can be understood as the most common isotope, \(^{35}\text{Cl}\)). To find the number of neutrons, you can subtract the number of protons from the atomic mass:

\[
\text{Number of neutrons} = \text{Atomic mass} - \text{Number of protons}
\]

\[
\text{Number of neutrons} = 35 - 17 = 18
\]

So, for a chlorine atom with a mass of 35, you have:

- **Protons (p)** = 17
- **Electrons (e)** = 17
- **Neutrons (n)** = 18

In summary:
- Atomic mass = 35
- p = 17
- e = 17
- n = 18

Answer 2

What is mass number of an atom with 19 electrons and 20 neutrons?
e -=
p +=
n 0 =
atomic mass=

Answer 3

The mass number of an atom is calculated by adding the number of protons and neutrons together.

1. **Electrons (e)**: The atom has 19 electrons.
2. **Protons (p)**: In a neutral atom, the number of protons is equal to the number of electrons. However, here we have 19 electrons, implying that the atom is neutral (the number of protons is also 19). Therefore, \( p = 19 \).
3. **Neutrons (n)**: The atom has 20 neutrons, so \( n = 20 \).

Now, to find the mass number (A):

\[
\text{Mass number} (A) = \text{Number of protons} + \text{Number of neutrons}
\]
\[
A = p + n = 19 + 20 = 39
\]

So, to summarize:

- **Electrons (e)** = 19
- **Protons (p)** = 19
- **Neutrons (n)** = 20
- **Atomic mass (mass number)** = 39

Thus the final values are:
- e = 19
- p = 19
- n = 20
- Atomic mass = 39