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What does the periodic law state?
The periodic law states that there is a periodic repetition of chemical and physical properties of elements when they are arranged by an increasing atomic number.
Who predicted the properties and existence of unknown elements?
Dmitri Mendeleev predicted the properties and existence of unknown elements, leaving blank spaces in the periodic table for undiscovered elements.
What significant contribution did Antoine Lavoisier make to chemistry?
Antoine Lavoisier compiled a list of all the known elements in the late 1700s.
What is the law of octaves as proposed by John Newlands?
The law of octaves states that when elements are arranged by increasing atomic mass, their properties repeat every eighth element.
Who created the modern periodic law?
Henry Mosely created the modern periodic law.
What are the columns and rows in the periodic table called?
Columns in the periodic table are referred to as groups, while rows are called periods.