Periodic classification of elements

1.Newlands relation is called

• a) Musical Law

• (b) Law of Octaves

• (c) Periodic Law

• (d) Atomic Mass Law

2.At the time of Mendeleev, the number of elements known was

• (a) 63

• (b) 65

• (c) 62

• (d) 64

3.An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong?

• (a) 4th group

• (b) 6th group

• (c) 3rd group

• (d) 2nd group

4.The arrangement of elements in the Modem Periodic Table is based on their

• (a) increasing atomic mass in the period

• (b) increasing atomic number in the horizontal rows

• (c) increasing atomic number in the vertical columns

• (d) increasing atomic mass in the group

5.Pick out the chemically most reactive elements from the given triads.

• (a) Li and F

• (b) Li and Br

• (c) K and F

• (d) K and Br

6.What is the atomic number of element of period 3 and group 17 of the Periodic Table?

• (a) 10

• (b) 4

• (c) 17

• (d) 21

The elements A, B and C belong to groups 1, 14 and 17 respectively of the Periodic Table. Which two elements will form ionic compounds?

• (a) A and B

• (b) A and C

• (c) B and C

• (d) None

A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?

• (a) MO

• (b) M2O

• (C) M2O3

• (d) MO2

Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.

• (a) Helium

• (b) Argon

• (c) Neon

• (d) Krypton

Which of the following set of elements is written in order of their increasing metallic character?

• (a) Na Li K

• (b) C Q N

• (c) Mg Al Si

• (d) Be Mg Ca