In the following diagram for the first three periods of the periodic table, five elements have been represented by the letters `a,b,c,d` and `e` (which are not their chemical symbols):

(i) Select the letter which represents a halogen.
(ii) Select the letter which represents a noble gas.
(iii) What type of bond is formed between `a` and `b`?
(iv) What type of bond is formed between `c` and `b`?
(v) Which element will form a divalent anion?

The following diagram shows a part of the periodic table containing first there periods in which five elements have been represented by the letters a,b,c,d and e (which are not their chemical symbols): (i) Select the letter which represents an alkali metal. (ii) Select the letter which represents a noble gas. (iii) Select the letter which represents a halogen. (iv) What type of bond is formed between a and e ? (v) What type of bond is formed between d and e ?

What does the first three letters represent is EcoRI?

A to F are the structural formulae of some organic compound (i) give the letter which represent the family. (ii) Give the letters which donot represent hydrocarbons. (iii) How can 'C' be converted into 'A'?

The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. ( The letters given here are not the chemical symbols of the elements): (i) Which elements has a bigger atom , a or f ? (ii) Which element has a higer valency, K or o ? (iii) Which element is more metallic, i or K ? (iv) Which element is more non - metallic , d or g ? (v) Select a letter which represents a non-metal of valency 2. (vi) Select a letter which represents a noble gas.

This question refers to elements of the periodic table with atomic numbers from 3 to 18. In the table below, some elements are shown by letters, even though the letters are not the usual symbols of the elements. Which of these is a halogen

Two elements X and Y have atomic numbers 12 and 16 respectively. To which period of the modern periodic table do these two elements belong ? What type of bond will be formed between them and why?

What do you mean by representative elements? Name the groups of the periodic table, which contain representative elements.

What do you mean by representative elements? Name the groups of the periodic table, which contain representative elements.

What do you mean by representative elements? Name the groups of the periodic table, which contain representative elements.