The elements in the periodic table are arranged in the _______ (increasing/decreasing) order of their atomic number.

Open in App

Solution

The systematic arrangement of elements into groups and periods is known as the periodic table.
The modern periodic law is stated as: “ Properties of elements are a periodic function of their atomic number.”
The main feature of the modern periodic table is that elements are arranged in the increasing order of their atomic numbers.
Horizontal rows are called periods and vertical columns are called groups in the modern periodic table.
There are 7 periods and 18 groups in the modern periodic table.
Therefore, The elements in the periodic table are arranged in the increasing order of their atomic number.

Suggest Corrections

Similar questions

Q. According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of:

(a) decreasing atomic numbers
(b) increasing atomic numbers
(c) decreasing atomic masses
(d) increasing atomic masses

Question 46
(a) In this ladder (Figure 5.2) symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.

(b) Arrange them in the order of their group also.

Which of the following statement is correct in regard to the classification of elements?

(a) Elements in the modern periodic table are arranged on the basis of increasing atomic numbers

(b) Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers

(c) In the modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.

(d) In the modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

Q. (a) Explain why:
(i) All the elements of a group have similar chemical properties.
(ii) All the elements of a period have different chemical properties.

(b) The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

Which of the following statement (s) about the Modern Periodic Table are incorrect

(i) The elements in the Modern Periodic Table are arranged based on their decreasing atomic number.

(ii) The elements in the Modern Periodic Table are arranged based on their increasing atomic masses.

(iii) Isotopes are placed in an adjoining group (s) in the Periodic Table.

(iv) The elements in the Modern Periodic Table are arranged based on their increasing atomic number.

Join BYJU'S Learning Program