(a) On what basis did Mendeleev arrange the elements in his periodic table?

(b) On what basis are they arranged now?

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Solution

(a) Mendeleev arranged the elements in his periodic table on the basis of atomic masses.
(b) In the modern periodic table, the elements are arranged on the basis of atomic numbers.

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In the modern periodic table, the elements are arranged on the basis of their increasing:

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

(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

Q. On the basis of atomic _______, the modern periodic table is arranged.

Q. Mendeleev arranged isotopes in horizontal rows in his periodic table.

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(a) On what basis did Mendeleev arrange the elements in his periodic table? (b) On what basis are they arranged now?

(a) Mendeleev arranged the elements in his periodic table on the basis of atomic masses. (b) In the modern periodic table, the elements are arranged on the basis of atomic numbers.

(a) On what basis did Mendeleev arrange the elements in his periodic table?

(b) On what basis are they arranged now?

(a) Mendeleev arranged the elements in his periodic table on the basis of atomic masses.
(b) In the modern periodic table, the elements are arranged on the basis of atomic numbers.