Chemical Formula of Elements with Atomic Masses
- Hydrogen (H): Atomic Mass 1; Valency 1; Electronic Configuration 1s1
- Helium (He): Atomic Mass 4; Valency 0; Electronic Configuration 1s2
- Lithium (Li): Atomic Mass 7; Valency 1; Electronic Configuration [He] 2s1
- Beryllium (Be): Atomic Mass 9; Valency 2; Electronic Configuration [He] 2s2
- Boron (B): Atomic Mass 11; Valency 3; Electronic Configuration [He] 2s2 2p1
- Carbon (C): Atomic Mass 12; Valency 4; Electronic Configuration [He] 2s2 2p2
- Nitrogen (N): Atomic Mass 14; Valency 3; Electronic Configuration [He] 2s2 2p3
- Oxygen (O): Atomic Mass 16; Valency 2; Electronic Configuration [He] 2s2 2p4
- Fluorine (F): Atomic Mass 19; Valency 1; Electronic Configuration [He] 2s2 2p5
- Neon (Ne): Atomic Mass 20; Valency 0; Electronic Configuration [He] 2s2 2p6

Explanation
The chemical formula of elements is represented by symbols from the periodic table along with their corresponding atomic masses. Each element has its own unique atomic mass, valency, and electronic configuration which determine its chemical properties.
Valency refers to the number of electrons an atom needs to gain, lose, or share to achieve a stable electron configuration. The electronic configuration of an element shows the distribution of electrons in its energy levels.
Understanding the chemical formula, atomic masses, and electronic configurations of elements is essential in chemistry as it helps in predicting how elements will interact with each other to form compounds.