State Mendeleev’s periodic law. Write two achievements of Mendeleev’s periodic table -Science

1 Answer

Answer :

Mendeleevs Periodic Law: Properties of elements are the periodic function of their atomic masses. Achievements:i It could classify all the elements discovered at that time. ii It helped in the discovery of new elements. iii it helped in the correction of the atomic mass of some of the elements.

Related questions

Description : Iron which resembles Cobalt and Nickel in properties has been placed far away from these elements. This was one of the limitations of : (1) Modern periodic table (2) Newland's law of octaves (3) Dobereiner's triads (4) Mendeleev's periodic table

Last Answer : (2) Newland's law of octaves Explanation: Among the major limitations of Newlands Law of Octaves, some similar elements have been separated from one another while some dissimilar elements have been placed in the same column.

Description : Explain the Mendeleev’s Law of classification of elements also describe advantages & disadvantages of his periodic table.

Last Answer : Ans : Mendeleeve's Law of Classification : Mendeleeve in 1869 arrange elements in order of increasing atomic masses. He placed chemically similar elements vertically beneath each other & concluded that : The ... metals. No Idea Of Atomic Structure : It failed to give the idea of atomic structure.

Description : State the characteristics of Mendeleev’s periodic table.

Last Answer : 1) Mendeleev’s periodic table consists of 7 periods (horizontal) and 9 groups (vertical). 2) Elements are arranged in the increasing order of their atomic weights. 3) The elements that have similar property were placed in vertical columns.

Description : Mendeleev's periodic table was based on?

Last Answer : increasing order of atomic mass

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Last Answer : Mendeleev’s periodic table Modern periodic table 1. Elements are arranged in the order of increasing atomic masses. 1. Elements are arranged in the order of increasing atomic numbers.

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Last Answer : There are 7 stages in Mendeleev's Periodic Table .

Description : What are the periods in Mendeleev's periodic table?

Last Answer : Because some of the elements were not yet discovered so he left them blank for other elements to be discovered. -bobby corner

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Last Answer : Because some of the elements were not yet discovered so he left them blank for other elements to be discovered. -bobby corner

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Last Answer : (2) Gallium

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Last Answer : Ans.Because Mendeleev gave priority to similarities in properties. Germanium and gallium

Description : State Mendeleev’s periodic law.

Last Answer : Mendeleev’s periodic law states that “The properties of elements are periodic functions of their atomic mass”.

Description : Mention the merits of Mendeleev’s periodic law.

Last Answer : Mendeleev left vacant spaces in the table for the elements that were to be discovered. He was able to predict the atomic mass and properties of elements even before their discovery. His periodic table helped to discover new elements like germanium.

Description : What is Mendeleev’s periodic law?

Last Answer : What is Mendeleev’s periodic law?

Description : What is Mendeleev's periodic law?

Last Answer : the principle that chemical properties of the elements are periodic functions of their atomic numbersMendeleev's periodic law states that properties of elements are periodic functions of their atomic masses.

Description : What is Mendeleev's periodic law?

Last Answer : the principle that chemical properties of the elements are periodic functions of their atomic numbersMendeleev's periodic law states that properties of elements are periodic functions of their atomic masses.

Description : MENDELEEV’S PERODIC TABLE

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Last Answer : Need answer

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Last Answer : (a) The vertical columns in the periodic table are called groups'. The horizontal rows in the periodic table are called periods'. (b) M' and N' belong to same period but group I ... oxides. Valency goes on increasing first and then decreases. MCI, NCI2 are molecular formulae of their chlorides.

Description : a) What is meant by periodicity in properties of elements with reference to the periodic table? (b) Why do all the elements of the same group have similar properties? (c) How will the tendency to gain electrons change as we go from left to right across a period? Why? -Science

Last Answer : (a) The repetition of same properties after definite interval is called periodicity in properties. (b) It is because they have same valence electrons therefore, have similar properties. (c) ... to right in a period because atomic size goes on decreasing and effective nuclear charge increases.

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Description : 1The elements of the second period of the Periodic Table are given below: Li Be B C N O F (a) Give reason to explain why atomic radii decrease from Li to F. (b) Identify the most (i) metallic and (ii)non-metallic element. -Science

Last Answer : a) It is because nuclear charge increases due to increase in atomic number, therefore, force of attraction between nucleus and valence electrons increases, i.e. effective nuclear charge increases, hence ... element is ‘F’ because it can gain electrons easily due to smallest atomic size.

Description : Give reason: In the construction of periodic table, the periodic law is broken in some places.

Last Answer : Hydrogen resembles both the alkali metals and halogens. But it has been placed with the alkalis. The lanthanides and actinides have not been placed in the main body of the table.

Description : Explain the Modern Periodic Law , also define salient features of modern periodic table

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Description : Can you describe some of ancient Egypt's achievements in mathematics science and technology?

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Last Answer : The elements of 1 st period are hydrogen and helium. a) Atomic size of hydrogen is larger then that of helium because atomic size decreases across a period. b) Ionisation energy of helium ... higher as it increases down the group. Electro negativity of fluorine as it decreases down the group.

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Last Answer : Mendeleev’s classification is based on atomic mass.

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Last Answer : Examples: density, melting point, atomic weight, density and formula of oxide.

Description : Write about major achievements of the NEP of 1991.

Last Answer : Write about major achievements of the NEP of 1991.

Description : The position of three elements A, B and C in the periodic table shown below: a) State whether A is a metal or non-metal. b) State whether C is more reactive or less reactive than A. c) Will C be larger or smaller in size than B?

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Last Answer : ANSWER: GERMANIUM

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Last Answer : Ans:(c)

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Last Answer : The sixth period

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Last Answer : Bottom left

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Last Answer : Right hand top

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Last Answer : Eighteen

Description : The vertical columns of the periodic table are called

Last Answer : Groups

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Last Answer : Henry Moseley

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Last Answer : Periods

Description : 1st noble gas group in the periodic table?

Last Answer : Helium

Description : First element in the periodic table?

Last Answer : Hydrogen

Description : Total number of elements in periodic table?

Last Answer : 118

Description : The longest period of the periodic table?

Last Answer : Sixth period

Description : The shortest period of the periodic table?

Last Answer : First period