mass number for hydrogen,sodium and chlorine????
H = 1 gram / mol
Na = 23
Cl = 35.5
if you google you can get lots of decimal places :)
By the way H usually appears as the H2 gas molecule which is 1*2 = 2 grams/mol
To determine the mass number for an atom, we need to know the number of protons and neutrons in its nucleus. The number of protons defines the element and is known as the atomic number. The mass number is the sum of protons and neutrons.
1. Hydrogen (H):
Hydrogen has an atomic number of 1, meaning it has 1 proton in its nucleus. The most common isotope of hydrogen, known as protium, has no neutrons. Therefore, the mass number of hydrogen is 1.
2. Sodium (Na):
Sodium has an atomic number of 11, indicating that it has 11 protons in its nucleus. To find the mass number, we need to know the number of neutrons. Sodium has several isotopes, but the most common isotope is sodium-23. It has 11 protons and 12 neutrons, so the mass number of sodium is 23.
3. Chlorine (Cl):
Chlorine has an atomic number of 17, implying that it has 17 protons in its nucleus. Similarly, we need to determine the number of neutrons to find the mass number. The most abundant isotope of chlorine is chlorine-35, which has 17 protons and 18 neutrons. Thus, the mass number for chlorine is 35.
In summary:
- Hydrogen has a mass number of 1.
- Sodium has a mass number of 23.
- Chlorine has a mass number of 35.