Elements have been arranged in the following sequence on the basis of their increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K
[2 MARKS]
(a) Pick two sets of elements which have similar properties.
(b) The given sequence represents which law of classification of elements?

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Solution

Each point: 1 Mark

(a) (i) F and Cl (ii) Na and K.

(b) Newland’s Law of Octaves.

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Question 17
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

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. Given below are a few elements arranged in the order of increasing atomic masses.
If every eighth element had properties similar to that of the first, according to Newlands’ Law of Octaves, identify such pairs.
(Note: At that time, noble gases were not discovered.)
| Li | Be | B | C | N | O | F | Na | Mg | Al | Si | P | S |

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Elements have been arranged in the following sequence on the basis of their increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K [2 MARKS] (a) Pick two sets of elements which have similar properties. (b) The given sequence represents which law of classification of elements?

Each point: 1 Mark (a) (i) F and Cl (ii) Na and K. (b) Newland’s Law of Octaves.

Elements have been arranged in the following sequence on the basis of their increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K
[2 MARKS]
(a) Pick two sets of elements which have similar properties.
(b) The given sequence represents which law of classification of elements?

Each point: 1 Mark

(a) (i) F and Cl (ii) Na and K.

(b) Newland’s Law of Octaves.