Given below are a few elements arranged in the order of increasing atomic masses- Identify the pair of elements with similar properties according to Newlands- Law of Octaves- Newlands- table of Octaves Element L i B e B C N O F Atomic mass 7 9 11 12 14 16 19 Element N a M g A l S i P S Atomic mass 23 24 27 29 31 32 Atomic mass 39 40

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Standard VII

Chemistry

Newland's Law Of Octaves

Given below a...

Question

Given below are a few elements arranged in the order of increasing atomic masses.
Identify the pair of elements with similar properties according to Newlands’ Law of Octaves.

O, P

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C, Si

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N, Si

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Be, Na

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Solution

The correct option is B C, Si
According to Newland’s Law of Octaves, the then known elements when arranged in the increasing order of their atomic masses, it is found that every eighth element had properties similar to that of the first.

In Newlands' Octaves, the properties of lithium and sodium were found to be same. Sodium is the eighth element after lithium. Similarly, carbon and silicon resemble each other where as others don't.

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Similar questions

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 |

Complete the following table relating to the atomic structure of some elements.

$\begin{matrix} Element & Atomic & Mass & Number of & Number of & Number of Symbol & Number & Number & Neutrons & Electrons & Protons L i & 3 & 6 C l & 17 & 20 N a & 12 & 11 A l & 27 & 13 S & 32 & 16 \end{matrix}$

Complete the following table.

Atomic number	Mass number	Number of Neutrons	Number of protons	Number of electrons	Name of the Atomic species
9	−	10	−	−	−
16	32	−	−	−	Sulphur
−	24	−	12	−	−
−	2	−	1	−	−
−	1	0	1	0	−

Q. According to Newlands' law of octaves, the elements were arranged in the increasing order of their atomic masses.

Q. Give alongside is a part of the periodic table :
As we move horizontally from left to right:

Li	Be		B	C	N	O	F
Na	Mg		Al	Si	P	S	Cl

(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?

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Given below are a few elements arranged in the order of increasing atomic masses. Identify the pair of elements with similar properties according to Newlands’ Law of Octaves.

Given below are a few elements arranged in the order of increasing atomic masses.
Identify the pair of elements with similar properties according to Newlands’ Law of Octaves.