What law says that when the elements are arranged in order of a crazing atomic mass there is a periodic pattern and their physical and chemical properties?

Answer 1

The law you are referring to is known as the Periodic Law. It states that when the elements are arranged in order of increasing Atomic Mass, there is a periodic pattern in their physical and chemical properties. This concept was foundational for the development of the Periodic Table, which organizes elements based on these recurring properties. Later, the law was refined to focus on atomic number rather than atomic mass, leading to modern periodic trends.