Two elements M and N beong to group I and II respectively and are in the same period of the periodic tabe. How do the follwoing properties of M and N vary ? Sizes of their atoms

Two elements M and N beong to group I and II respectively and are in t

1.	Two elements M and N beong to group I and II respectively and are in the same period of the periodic tabe. How do the follwoing properties of M and N vary ? Sizes of their atoms
Answer» Solution : a) The vertical COLUMNS in the PERIODIC table are called group. The horizontal rows in the periodic table are called periods. b) 1. M and N belong to the same period but I and II. Therefore N will be smaller than Mas atomic size is decreasing from left to right. 2. M is more metallic than N. Metallic character goes on decreasing from left to right as tendency to lose electrons decreases DUE to decrease in atomic size. 3. Their valencies are 1 and 2 respectively in forming OXIDES. Valency goes on increasing first and then increases. 4. `MCI, NCI_2`are molecular formulae of their CHLORIDES.