It has 6 electrons, and 4 valence electrons
The prefix "poly-" means "many," and "atomic" refers to atoms, so a polyatomic ion is made of 2+ atoms covalently bonded together. These ions are charged, which is why they can never stand alone.
Answer: physical
Explanation: freezing and melting are physical changes.
Answer:
what would the question be?
Answer:
the answer is photosynthesis
