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1.
The atom of an element has electronic con-figuration 2, 8, 7. To which of the following elements would it be chemically similar?
2.
Which of the following set of elements is written in order of their increasing metallic character?
3.
Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group?
4.
An element 'A' belongs to the third period and group 16 of the Periodic Table. Find out the valency of A.
5.
Consider the following elements
20Ca, 8Or 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be in group 16 of the Periodic Table?
20Ca, 8Or 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be in group 16 of the Periodic Table?
6.
An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
7.
An element X combines with oxygen to form an oxide XO. This oxide is electrically con
8.
Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.
9.
A metal 'M' is in the first group of the Periodic Table. What will be the formula of its oxide?
10.
An element X from group 2 of the Periodic Table reacts with Y from group 17 to form a compound. Give the formula of the compound.