Elements A, B and C have atomic numbers 9, 10 and 20 respectively. State which one is
(i) a metal
(ii) non-metal
(iii) chemically inert.
Explain the formation of bond between any two elements. Draw its orbital diagram. Name the type of bond.

Elements A, B and C have atomic numbers 9, 20 and 10 respectively. State which one is : (i) a non-metal (ii) a metal (iii) chemically inert.

Elements A, B and C have atomic numbers 9, 20 and 10 respectively. Write down the formula of the compound formed by two of the above elements.

The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group ?

The position of elements A,B,C,D and E in the periodic table are shown below : State which is the most reactive (i) metal (ii) non metal .

Four elements P, Q, R and S have atomic numbers 12, 13, 14 and 15 respectively. Answer the following questions giving reasons: (i) What is the valency of Q ? (ii) Classify these elements as metals and non-metals. (iii) Which of these elements will form the most basic oxide?

There are three elements E, F, G with atomic numbers 19, 8 and 17 respectively. Give the molecular formula of the compound formed between E and G and state the type of chemical bond in this compound.

An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide (a) Where in the periodic table are elements X and Y placed ? (b) Classify X and Y as metal (s), non-metal (s) or metalloid (s) (c) What will be the nature of oxide of element Y ? Identify the nature of bonding in the compound formed (d) Draw the electron dot structure of the divalent halide.

Na, Mg and Al are the elements of the 3^(rd) period of the Modern Periodic Table having group number 1, 2 and 13 respectively . Which one of these has the (a) highest valency (b) largest atomic radius, and (c ) maximum chemical reactivity? Justify your answer stating the reason for each.

Oxidation number is the charge which an atom of an element has in its ion or appears to have when present in the combined state. It is also called oxidation state. Oxidation number of any atom in the elementary state is zero. Oxidation number of a monoatomic ion is equal to the charge on it. In compounds of metals with non metals, metals have positive oxidation number while non metals have negative oxidation numbers. In compounds of two difference elements, the more electronegative element has negative oxidation number whereas the other has positive oxidation number. In complex ions, the sum of the oxidation number of all the atoms is equal to the charge on the ion. If a compound contains two or more atoms of the same element, they may have same or different oxidation states according as their chemical bonding is same or different. The oxidation state of the most electronegative element in the products of the reaction between BaO_(2) and H_(2)SO_(4) are

Oxidation number is the charge which an atom of an element has in its ion or appears to have when present in the combined state. It is also called oxidation state. Oxidation number of any atom in the elementary state is zero. Oxidation number of a monoatomic ion is equal to the charge on it. In compounds of metals with non metals, metals have positive oxidation number while non metals have negative oxidation numbers. In compounds of two difference elements, the more electronegative element has negative oxidation number whereas the other has positive oxidation number. In complex ions, the sum of the oxidation number of all the atoms is equal to the charge on the ion. If a compound contains two or more atoms of the same element, they may have same or different oxidation states according as their chemical bonding is same or different. A compound of Xe and F is found to have 53.3% Xe (atomic weight =133). Oxidation number of Xe in this compound is