Na. Si is often considered a semi-metal or metalloid.
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C-P 14K likely refers to the metal composition of the ring. "C-P" is likely the manufacturer's mark or logo, and "14K" indicates that the ring is made of 14 karat gold, which is a common type of gold used in jewelry.
These elements (1 to 30) are: H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn. The element with the atomic number 30 is zinc (Zn).
Hydrogen (H) Helium (He) Lithium (Li) Beryllium (Be) Boron (B) Carbon (C) Nitrogen (N) Oxygen (O) Fluorine (F) Neon (Ne) Sodium (Na) Magnesium (Mg) Aluminum (Al) Silicon (Si) Phosphorus (P) Sulfur (S) Chlorine (Cl) Argon (Ar) All these elements are classified as metals, except for hydrogen and helium, which are nonmetals or noble gases.
The melting point of p-phenylenediamine is around 142-143°C.
The group 5A non-metal that is a solid at room temperature is phosphorus with the symbol P.