The word "Arseinio" can be a bit tricky to spell. It is pronounced /ɑː(ɹ)sɛɪniəʊ/ and consists of two morphemes: "arseno-" meaning "arsenic", and "-io", which is often used in chemical names to denote an ion. The correct spelling is "arsenio" with only one "i" and without the ending "-o" that is sometimes mistakenly added. Reading and understanding the phonetic transcription can help ensure the correct spelling of this word.