A closed system is completely closed to the outside environment. Every interaction is transmitted inside that closed system.
Answer:
Transition elements are elements which have partially filled d-orbitals and form at least one or more stable ions.
Elements are separate particles that contain the properties of only one type of element (pure substance) and an atom represents that element as the smallest non divisible particle that retains the properties of that element. Compounds can be formed by conjoining different atoms together in different ratios and shapes, so a combination of elements.
