NH4+ (Ammonium ion)

The ammonium ion (NH₄⁺) is a positively charged particle formed when ammonia (NH₃) gains a hydrogen ion (H⁺). It is common in nature and important for the nitrogen cycle, helping plants absorb nitrogen. In water, ammonium can come from natural sources or pollution, and its presence can affect water quality. It exists in balance with ammonia, depending on pH and other conditions. The ion plays a vital role in ecosystems and industries like agriculture, where it is used in fertilizers to promote plant growth.