Question

Which of the following statements are true about the modern form of the periodic table?
A.Properties of the elements are the periodic functions of their atomic number.
B. There are 7 periods
C. There are 18 numbered groups.
D. All of the above

Answer 1

Hint : The modern periodic table which is called as the long form of “periodic table” is the most convenient and widely used version. It has horizontal rows called periods and vertical columns called groups. Elements with similar outer electronic configuration belong to the same group or family in this modern periodic table.

Complete Step By Step Answer:
The chemical elements are arranged in the form of a table in the order of their increasing atomic number in the modern periodic table. There are seven rows called as periods and eighteen columns known as groups in the periodic table. Thus, all the three statements are true.
Therefore, the correct option is option D.

Additional Information:
Modern periodic table is the tabular display of chemical elements arranged in the order of their atomic number, electronic configuration and chemical properties. There are seven rows called periods which were earlier called as series and eighteen columns called groups in the Mendeleev periodic table. The rows have metals on their left and nonmetals on their right. Among the groups, the group seventeen elements are halogens, and the group eighteen are the noble gases. The beginning of each new period in the periodic table denotes the first time an electron occupies a new shell. The first element in the table is hydrogen. The first $94$ elements, from hydrogen to plutonium, all occur naturally. The elements from $95$ to $118$ are synthesized in laboratories, nuclear reactors, etc. There are a total of $118$ elements in the periodic table. Mendeleev also predicted properties of some unidentified elements that are expected to fill the gaps within the table.

Note :
In the modern periodic table, elements are arranged in the increasing order of their atomic number and not atomic mass. The physical and chemical properties of the elements are the periodic function of the atomic numbers