Question
What is mass number of an atom with 19 electrons and 20 neutrons?
e -=
p +=
n 0 =
atomic mass=
e -=
p +=
n 0 =
atomic mass=
Answers
GPT-4o mini
To determine the mass number of an atom, you can use the formula:
\[
\text{Mass Number (A)} = \text{Number of Protons (Z)} + \text{Number of Neutrons (N)}
\]
1. **Electrons:** The number of electrons in a neutral atom is equal to the number of protons. Since there are 19 electrons, the atom has 19 protons.
\[
\text{Number of Protons (p)} = 19
\]
2. **Neutrons:** According to the information given, the atom has 20 neutrons.
\[
\text{Number of Neutrons (n)} = 20
\]
3. **Mass Number:** Now, we can calculate the mass number:
\[
\text{Mass Number (A)} = \text{Number of Protons (p)} + \text{Number of Neutrons (n)} = 19 + 20 = 39
\]
So, we can summarize the information as follows:
- **e (electrons)** = 19
- **p (protons)** = 19
- **n (neutrons)** = 20
- **atomic mass (mass number)** = 39
The mass number of the atom is **39**.
\[
\text{Mass Number (A)} = \text{Number of Protons (Z)} + \text{Number of Neutrons (N)}
\]
1. **Electrons:** The number of electrons in a neutral atom is equal to the number of protons. Since there are 19 electrons, the atom has 19 protons.
\[
\text{Number of Protons (p)} = 19
\]
2. **Neutrons:** According to the information given, the atom has 20 neutrons.
\[
\text{Number of Neutrons (n)} = 20
\]
3. **Mass Number:** Now, we can calculate the mass number:
\[
\text{Mass Number (A)} = \text{Number of Protons (p)} + \text{Number of Neutrons (n)} = 19 + 20 = 39
\]
So, we can summarize the information as follows:
- **e (electrons)** = 19
- **p (protons)** = 19
- **n (neutrons)** = 20
- **atomic mass (mass number)** = 39
The mass number of the atom is **39**.