Chapter 3.4, Problem 3RQ

Interpretation Introduction

Interpretation: The “stair-step” line on the periodic table needs to be explained.

Concept introduction:  A table in chemistry, where all elements are arranged by increasing atomic number is described as periodic table. There are more than 100 elements in the world and the periodic table classifies these elements.

Answer to Problem 3RQ

The stair-step line indicates the position of metals, non-metals and metalloids in the Periodic Table.

Explanation of Solution

The periodic table is a very useful way to arrange elements. In a periodic table, the border line between the metals and non-metals are defined as “stair-step” line. Elements that are on the right side of stairs, called non-metals and elements that are on right side of stairs, called metals.  Elements along the stair-step line are known as metalloids.

Conclusion

In a periodic table, stair-step line separates metals from non-metals.