Manipur Board Solutions for Chapter: Periodic Classification of Elements, Exercise 7: Let us answer these

What names have been given to the horizontal arrangement of elements in the periodic table? Is there any gradation in the properties of elements across these rows? Give two examples to illustrate. 

How do the properties of group$1$ elements differ from those of group$17$ elements? Illustrate the differences in at least two properties.

From the standpoint of the atomic structure, what determines which element will be the first and which will be the last in a period of the periodic table?

Accommodation of isotopic form of the same element was an upset in Mendeleev's periodic table. How could the Modern periodic table remove the anomaly?

Name two elements you would expect to show chemical reactions similar to lithium. What is the basis of your choice?

Fluorine, chlorine and bromine belong to group $17$ of the periodic table. What similarity is there in the atoms of these elements ?

By considering their position in the periodic table, which one of the following elements is expected to have maximum metallic character? 
$\mathrm{In}, \mathrm{Sn}, \mathrm{Sb}, \mathrm{Te}, \mathrm{I}$.

Why are non-metals found on the right-hand side of the periodic table towards the top?