Final answer:
Hydrazine, N₂H₄, is a molecule consisting of nitrogen and hydrogen atoms. It is not a neutral element, an ion, or any other form of chemical species. In this compound, two nitrogen atoms and four hydrogen atoms are chemically bonded.
Step-by-step explanation:
N₂H₄, known as hydrazine, is b) A molecule. This chemical compound is composed of two nitrogen atoms and four hydrogen atoms, making it a stable polyatomic molecule that is not charged, and therefore it's not an ion. Hydrazine is often used as a rocket fuel and is also found in several industrial applications.
The atoms within N₂H₄ are a) Nitrogen and hydrogen. These are the only two elements present in the molecule of hydrazine. Nitrogen and hydrogen combine in a specific ratio to form this compound, with each molecule consisting of two nitrogen atoms and four hydrogen atoms in a specific geometric arrangement where the two nitrogen atoms are bonded to each other as well as to hydrogen atoms.