In the Mendeleev's periodic table the elements with similar chemical properties are in the same . [1 Mark]

(a) octave
(b) period
(c) triad
(d) group

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Solution

The correct answer is (d) group.

Mendeleev arranged the then known sixty three elements in horizontal rows and vertical columns and gave his periodic table. He found that the chemical and physical properties of an element repeat after a regular interval when arranged on the basis of increasing atomic masses. All the elements with similar chemical properties ended up in the same column which he named as groups.

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Q. (a) State Mendeleev's periodic law.
(b) What chemical properties of elements were used by Mendeleev in creating his periodic table?
(c) State any three limitations of Mendeleev's classification of elements.
(d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table?
(e) Which group of elements was missing from Mendeleev's original periodic table?

Q. (a) Explain why, the first period of the modern periodic table has only two elements whereas second period has eight elements
(b) Why do elements in the same group show similar properties but the elements in different groups show different properties?
(c) For each of the following triads, name the element with the characteristics specified below:

Elements	Least atomic radius	Chemically least reactive
(i) F, Cl, Br (ii) Li, Na, K	.................... ....................	.................... ....................

(d) State one reason for keeping fluorine and chlorine in the same group of the periodic table.
(e) What are the merits of the modern periodic table of elements?

Fill in the following blanks with suitable words :

(a) The basis for the modern periodic table is ……………

(b) The horizontal rows in a periodic table are called ……………

(d) Group 17 elements are known as ……………

(e) Group 18 elements are called ……………

(f) According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the …………… element starting from oxygen.

Q. Read the given statements carefully.
(a) There are total of 7 columns in the Modern periodic table.
(b) Mendeleev arranged the elements in the increasing order of their atomic numbers and according to their chemical properties
(c) Newlands’ law of Octaves worked well with lighter elements only.
The correct statement(s) is/are

Q. In Mendeleev's periodic table, elements with similar chemical properties are in same ______ .

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In the Mendeleev's periodic table the elements with similar chemical properties are in the same . [1 Mark] (a) octave (b) period (c) triad (d) group

In the Mendeleev's periodic table the elements with similar chemical properties are in the same . [1 Mark]

(a) octave
(b) period
(c) triad
(d) group