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What is the main principle used to arrange the elements in the Modern Periodic Table of Elements?
Why do elements in the same group have similar chemical properties?
If an element has 7 valence electrons, in which group is it placed?
The element Helium (He) is in Group 18 even though it only has 2 valence electrons. What is the reason for this exception?
What determines the Period number of an element in the Periodic Table?
The transition elements are located between which groups in the Periodic Table?
How many elements are in Period 2?
The Actinide Series is placed at the bottom of the Periodic Table to make it neater. In which period is this series actually located?
Which of the following is true about the elements in Period 3?
What is the term for the horizontal row in the Periodic Table of the Elements?