# What is modern periodic law

## What is modern periodic law answer?

Modern Periodic Law Definition

The modern Periodic law can be stated as: “The physical and chemical properties of the elements are periodic functions of their atomic numbers”. The atomic number is equal to the number of electrons or protons in a neutral atom.

## What is modern periodic law class 10?

Moseley gave the Modern Periodic Law which states that: Physical and chemical properties of the elements are the periodic function of their atomic numbers. Atomic mass of an element is due to the mass of protons and neutrons present in the nucleus of its atom.

## What is the basis of modern periodic law?

According to the Modern periodic law , the properties of the element and their compounds are a periodic function of their atomic numbers . When elements are placed according to atomic number , then similar electronic configuration are repeated after regular interval .

Dmitri Mendeleev

Dmitri Mendeleev

## Why is 7th period considered incomplete?

7th period is considered as incomplete period even though it has 32 elements. Because it consists of elements whose properties have not been studied properly yet.

## Why is periodic law important?

To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.

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## What are the limitations of modern periodic table?

Answer. (a) Position of hydrogen: It could not assign a correct position to hydrogen in the table. (b) The lanthanides and actinides are not placed in the main body of the table. (c) Position of isotopes: There are no separate positions for isotopes of an element.

## What is the modern periodic table called?

The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table. And it consists of 18 vertical columns and 7 horizontal rows.

## What forms the basis of modern periodic table?

Explanation: Modern periodic table is based on the atomic numbers of elements as according to the modern periodic law the properties of elements are a periodic function of their atomic numbers.

## What are the features of modern periodic table?

The main features of modern periodic table

• Elements are arranged in the increasing order of atomic numbers.
• Elements in the modern periodic table are arranged in 7 periods and 18 groups.
• Horizontal rows are called periods and vertical columns are called groups.

## What is the basis of classification of modern periodic table?

Periodic Classification of Elements Characteristics

In the long form periodic table the elements are arranged in the order of their atomic numbers. Atomic number of an element is equal to the number of protons inside the nucleus of its atom.

## Why was Mendeleev’s periodic law rejected?

He was unable to locate hydrogen in the periodic table. Increase in atomic mass was not regular while moving from one element to another. Hence, the number of elements yet to be discovered was not predictable. Later on, isotopes of elements were found which violated Mendeleev’s periodic law.