Q.1.
_____ group contains the member ofhalogen family.
Q.2.
The number of periods and groups in theperiodic table are______.
Q.3.
4.The arrangement of elements in the Modem Periodic Table is based on their
Q.4.
2.At the time of Mendeleev, the number of elements known was
Q.5.
3.An atom of an element has the electronic confi-guration 2,8,To which group does it belong?
Q.6.
5.Pick out the chemically most reactive elements from the given triads.
Q.7.
A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?
Q.8.
6.What is the atomic number of element of period 3 and groupof the Periodic Table?
Q.9.
Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.
Q.10.
Which of the following set of elements is written in order of their increasing metallic character?