According to the Periodic Law
Each column on the periodic table is called
Elements to the left of the zigzag line are
Mendeleev arranged the elements according to
The horizontal rows in the periodic table are called
What is necessary for substances to burn?
Transition metals are
What element makes up about 20% of the air we breathe?
How do the physical and chemical properties of the elements change?
How many of the recently discovered elements follow periodic law?
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