Answer:
The elements in the modern periodic table are arranged on the basis of their atomic number. The atomic number of an element represents the number of protons found in the nucleus of an atom of that element. This fundamental property of elements is used as the primary criterion for arranging them in the periodic table.
The modern periodic table is organized into periods (horizontal rows) and groups (vertical columns). Each period represents a different energy level or shell in which the electrons of the elements reside, while each group represents elements with similar chemical properties. The arrangement of elements in this manner allows for a systematic organization that reveals trends and patterns in their properties.
The atomic number determines the position of an element in the periodic table. Elements with lower atomic numbers are placed towards the left side, while those with higher atomic numbers are placed towards the right side. For example, hydrogen, with an atomic number of 1, is located at the top left corner of the periodic table, while uranium, with an atomic number of 92, is located towards the bottom right corner.
Arranging elements by atomic number provides several advantages. Firstly, it ensures that elements with similar properties are grouped together. This allows for easier identification and comparison of elements with similar chemical behavior. Secondly, it reflects the underlying structure and organization of atoms, as atomic number directly relates to the number of protons present in an atom's nucleus. Lastly, it allows for the prediction of an element's properties based on its position in the periodic table.
While boiling point and atomic mass are important properties of elements, they are not used as primary criteria for arranging elements in the periodic table. Boiling point is a physical property that depends on various factors such as intermolecular forces and molecular structure. Atomic mass represents the average mass of all isotopes of an element and can vary due to different isotopic abundances. However, these properties can be correlated to some extent with an element's position in the periodic table.
In conclusion, the elements in the modern periodic table are arranged based on their atomic number. This arrangement allows for a systematic organization of elements, revealing trends and patterns in their properties. While boiling point and atomic mass are important properties, they are not used as primary criteria for arranging elements in the periodic table.
Step-by-step explanation: