Note: The lithium ion has 3 atomic numbers. The number of electrons is three in a neutral lithium atom. The first shell 1s can accommodate only two electrons. The third electron will be in second shell 2s.
People also ask, how do you find the atomic number?
Now you know that atomic number = number of protons, and mass number = number of protons + number of neutrons. To find the number of neutrons in an element, subtract the atomic number from the mass number. Here are a couple example: A single helium (He) atom has a mass number of 4 and an atomic number of 2.
Additionally, what is the atomic number of lithium 7?
| Element Name | Lithium |
|---|---|
| Atomic Number | 3 |
What is the atomic number of sodium 23?
| Element Name | Sodium |
|---|---|
| Atomic Number | 11 |
Which element has an atomic number of 16?
| Atomic Number | Symbol | Name |
|---|---|---|
| 16 | S | Sulfur |
| 17 | Cl | Chlorine |
| 18 | Ar | Argon |
| 19 | K | Potassium |
Why is the mass number of lithium atom is 7?
A lithium atom contains 3 protons in its nucleus irrespective of the number of neutrons or electrons. … Notice that because the lithium atom always has 3 protons, the atomic number for lithium is always 3. The mass number, however, is 6 in the isotope with 3 neutrons, and 7 in the isotope with 4 neutrons.