The Peiodic Table CHEMISTRY - The Peiodic Table

Which period is (a) shortest (b) longest in the long form of periodic table? How many elements are in (a) and (b)?

Name four elements of VIIA group. State the common name of this group of elements.

Name four alkaline earth metals. To which group do they belong?

Name four alkali metals. To which group do they belong?

The elements A and B obey law of octaves. How many elements are between A and B?

The elements A and B have electronic configuration 2, 8, 18, 2 and (2, 6) respectively.
(a) To which periods A and B belong?
(b) To which group A and B belong?

State two merits of Mendeleev’s periodic table over previous attempts of classification of the elements.

(a) What are the basis of classification of elements in Mendeleev’s periodic table?
(b) State Mendeleev’s periodic law.

State two reasons for rejecting the law of octaves.

(a) Name an alkali metal other than lithium, sodium and potassium.
(b) Name an alkaline earth metal other than calcium, strontium and barium
(c) Name one halogen other than chlorine, bromine and iodine
(d) Name a non metal having properties similar to carbon.
(e) Name a rare gas other than neon, krypton and xenon.

Give the name and symbol of the following elements which occupy each of the following position in periodic table.

Actinides are elements from atomic number ________to ________and are radioactive.

Lanthanide are the elements from atomic number 57 to ________and are placed ________the periodic table.

The seventh period is also ________period, but is ________

The sixth period has ________elements and is called ________period.

The fourth and fifth periods have ________elements and are called ________periods.