Answer the following questions:
Which column is known as the zero group in the modern periodic table ?

Answer the following questions : Match the columns :

Answer the following questions: Write a short note on the zig-zag line in the modern periodic table.

Answer the following questions: Considering the elements of period 3 in the modern periodic table, answer the following questions : State the most electronegative element in this period.

Answer the following questions: Considering the elements of period 3 in the modern periodic table, answer the following questions : Name the 'element' in which all the shells are completely filled with electrons.

Answer the following questions: Considering the elements of period 3 in the modern periodic table, answer the following questions : Name the element which has one electron in the outermost shell.

How many groups are there in the modern periodic table?

Answer the following questions: Define time period.

Answer the following questions: What is meant by periodic trends in the modern periodic table?

In the modern periodic table, the elements are arranged in the increasing order of their atomic number. This arrangement is based on the modern periodic law, which states that the properties of elements are a periodic function of their atomic numbers. In the modern periodic table, each column is called a group and each row is called a period. Elements within the same group show similarity and gradation in properties. This is due to the same number of electroms in the outermost shell . Based on the above paragraph, answer the following question: How many groups are there in the modern periodic table?

Answer the following questions: Write a short note on : Moseley's contribution and the modern periodic table.