Atomic Number Z = 3 – Element: Lithium (Li)
Valency of Lithium (Li):
– The atomic number (Z) defines an element’s identity, and in this case, Z = 3 corresponds to the element lithium.
– Lithium has an electron configuration of 1s² 2s¹, indicating that it has 3 electrons arranged in different energy levels.

Understanding Valency:
– Valency describes an element’s tendency to combine with other elements to achieve a stable electron configuration.
– For lithium (Li), the valency refers to its willingness to form chemical bonds by losing or sharing electrons to reach a stable state.

Valency of Lithium (Li):
– Lithium has one valence electron in its outermost shell (2nd shell).
– Valency typically refers to the charge an element tends to acquire by losing or gaining electrons to achieve stability.
– Lithium tends to lose its one valence electron to achieve the electron configuration of the noble gas helium (He).

Conclusion – Valency of Lithium (Li):
– With Z = 3, representing lithium, the valency of lithium is + 1.
– This valency of +1 indicates that lithium tends to lose one electron to form compounds and achieve a more stable electron configuration, making it more chemically reactive by losing its valence electron.