What are the mass and the atomic number for the anion of Cl 35?
To determine the mass and atomic number of the anion of Cl 35, we first need to understand the concept of anions.
Anions are negatively charged ions that are formed when atoms gain electrons. In the case of the chlorine atom (Cl), it has 17 protons and 17 electrons when it is neutral. However, when it gains one electron, it becomes negatively charged and forms an anion.
Now, let's calculate the mass and atomic number for the anion of Cl 35:
1. Atomic number: The atomic number of an element is equal to the number of protons in its nucleus. Since the anion of Cl 35 (chlorine-35) still contains the same number of protons as the neutral chlorine atom, its atomic number remains unchanged at 17.
2. Mass number: The mass number of an element is the sum of protons and neutrons in its nucleus. Chlorine-35 (Cl 35) has 17 protons and approximately 18 neutrons. When chlorine-35 gains an electron and becomes an anion, its mass number remains unaffected. Therefore, the mass number of the anion of Cl 35 is also 35.
In summary, the atomic number is 17, and the mass number is 35 for the anion of Cl 35.