Periodic classification of elements Worksheet-4
A. C B. Mg C. O D. S
A. Alkali metals B. Inert metals
C. Noble gases D. Halogens
C. First increases then decreases
D. Remains constant
A. Increases one by one from IA to VIIA
B. Decreases one by one form IA to VIIA
C. Increases one by one from IA to IVA and then decreases from VA to VIIA one by one
D. Decreases one by one from IA to IVA and then increases from VA to VIIA one by one
A. B B. Be C. Mg D. Al
A. Atomic number B. Mass number
C. Binding energy D. Number of isotopes
A. Na B. Fe C. Li D. He
A. Li B. Mg C. Ca D. Na
A. Sodium and potassium B. Fluorine and chlorine
C. Calcium and magnesium D. Boron and silicon
A. 2 B. 8 C. 18 D. 32
Explanation: Size of atom decreases from left to right in a period.
Explanation: Because of the non-metallic character increases. Oxides of metals are basic in nature and that of non-metals are acidic in nature.
Explanation: Chemical behavior of an atom depends upon the number of valence electrons. Hence the chemical behavior depends upon the atomic number.
Explanation: Li because of its smallest size.
Explanation: Boron and silicon exhibit the properties of both metals and non-metals. Hence they are metalloids.