Question

The modern periodic table is divided into:

Answer 1

Modern periodic table:

• In 1869, the Russian chemist Dmitri Mendeleev created the framework that was later modified into the modern periodic table,
• The modern periodic table is a tabular display of the chemical elements.
• The elements in the periodic table are arranged in order of atomic number.

Classification into groups and periods:

• The modern periodic table is divided into 7 periods and 18 groups.
• A period is the elements that are arranged in a horizontal row of the periodic table.
• A group is the elements that are arranged in a vertical row of the periodic table.

Classification into s,p,d, and f blocks:

• In the periodic table, the elements are divided into four blocks namely s,p,d, and f.
• The first two groups are known as s- block elements
• The 13th group to 18th group elements are known as p-block elements
• The 3rd group to 12th group elements are known as d- block elements
• d- block elements are known as transition elements.
• The F-block elements are classified into two series- lanthanoids and actinoids.
• The d-block of elements is called inner transition metals.
• They are placed separately in the sixth and seventh rows.