The atomicity or valency of an element refers to the number of chemical bonds that an atom of that element can form. It is determined by the number of valence electrons present in the outermost energy level of an atom. Here are the atomicity numbers for the elements:
- Hydrogen (H) - Atomicity: 1
- Helium (He) - Atomicity: 0 (He is a noble gas and has a completely filled outermost energy level)
- Lithium (Li) - Atomicity: 1
- Beryllium (Be) - Atomicity: 2
- Boron (B) - Atomicity: 3
- Carbon (C) - Atomicity: 4
- Nitrogen (N) - Atomicity: 3 or 5
- Oxygen (O) - Atomicity: 2
- Fluorine (F) - Atomicity: 1
- Neon (Ne) - Atomicity: 0
The atomicity of elements beyond neon can vary, depending on their position in the periodic table and the number of valence electrons they possess. If you would like the atomicity numbers for specific elements or elements beyond neon, please let me know.