How are elements arranged in the modern periodic table?

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Solution

In 1913, Henry Moseley showed that the atomic number of an element is a more fundamental property than atomic mass.
Elements are arranged in the increasing order of their atomic numbers.
The modern Periodic law can be stated as:
“The physical and chemical properties of the elements are periodic functions of their atomic numbers”.

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Question 4
Which of the following statement(s) about the Modern Periodic Table are incorrect?

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

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

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

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

(a) (i) only
(b) (i), (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (iv) only

Q. Study the image above. How are the elements arranged in the modern periodic table?

Q. The elements in modern periodic table are arranged in ____ order of their _______ number.

In the Modern Periodic Table, the elements are arranged on the basis of their increasing:

How many elements are there in sixth period in modern periodic table.

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