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"SPCSS." (n.d.). Fullformexpand.com. Retrieved July 30, 2026, from https://www.fullformexpand.com/spcss/stored-program-control-switching-system.
SPCSS. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/spcss/stored-program-control-switching-system (Accessed: 30 July 2026).
Nitrogen (Symbol: N, Atomic number: 7) is a non-metal element discovered in 1772. It belongs to period 2 and group 15 of the periodic table. It is the most abundant…