Answer:a
Explanation:
i think so cs i read the ariticle
Electrons are orbiting the nucleus in the fxed way paths located in solid sphere
Answer:
Copper turns green on exposure to air
Explanation:
Liquid water freezes to form ice: Physical change
Reason: Water can melt back when it becomes ice.
Copper turns green on exposure to air: Chemical change
Reason: The copper can not change back from the green state when it turns green.
