A' and 'B' are atoms of two elements belonging to period 2. 'A' is in group 14 and 'B' is in group 17.
a. Identify elements 'A' and 'B'
b. Which one is more electronegative?

Atoms of two different elements are represented in the following diagram. Indentify elements A and B.

Study the below given periodic table in which four elements are indicated by alphabets: A, B, C and D. Identify element 'A' and write its electronic configuration.

Match the elements given in Group 'A' with their electronic configuration given in Group 'B'.

A scientist studying reactions of metals and non-metals. He knew group 1 and 2 elements are metals while group 17 elements are non-metals. So, he chooses different elements from group 1 and 2 and group17 Name the element in group 17 which belongs to the same period as sodium.

Match the following : Match group 'A' with group 'B' :

Write the atomic number.of the element in the third period and seventeenth group of the periodic table.

Select the two options in the 'B' group related to 'A' group.

Mendeleev predicted the existence of certain elements not know at that time. He named two of these elements as eka-aluminium and eka-silicon. a. Name the elements which have taken the place of these elements. b. Mention the group and period of these elements in the modern periodic table. c. Which one of these two elements is a metalloid? d. How many valence electrons are present in eka-silicon? e. Eka-aluminium forms a chloride. What is its formula?

A scientist studying reactions of metals and non-metals. He knew group 1 and 2 elements are metals while group 17 elements are non-metals. So, he chooses different elements from group 1 and 2 and group17 Name the element in group 17 which forms a diatomic molecule and exists in solid state at room temperature .

Group 1 and group 2 elements are placed at the ______ of the long form of the modern periodic table .