Description : Who Classified Elements as Triads?
Last Answer : Dobereiner
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 : The elements of the third period of the Periodic Table are given below: periodic-classification-of-elements-chapter-wise-important-questions-class-10-science-1 (a) Which atom is bigger, Na or Mg? Why? (6) Identify the most (i) metallic and (ii) non-metallic element in Period 3. -Science
Last Answer : (a) Sodium is bigger than magnesium as it has lesser nuclear charge so there is less force of attraction between nucleus and valence electrons and less effective nuclear charge. It is, therefore, ... the most non-metallic element because it can gain electrons easily due to its smallest atomic size.
Description : What are the limitations of Dobereiner’s law of triads?
Last Answer : Dobereiner’s classification was not satisfactory, as he failed to arrange all of the then known elements in the form of triads. He could identify only three triads from the elements known at that time
Description : Explain Dobereiner’s law of triads with an example.
Last Answer : According to Dobereiner's law of triads: When elements are arranged in the order of increasing atomic masses in groups of three elements, the atomic mass of the middle element of the triad is equal to the ... Average atomic mass = 177 2 88.5 The atomic mass of middle element Strontium = 88
Description : What are triads?
Last Answer : Elements arranged in group of three are called triads.
Description : State Dobereiner’s law of triads.
Last Answer : According to Dobereiner’s law of triads: When elements are arranged in the order of increasing atomic masses in groups of three elements, the atomic mass of the middle element of the triad is equal to the average atomic mass of the other two elements.
Description : DRAWBACK OF DOBEREINER’S TRIADS:-
Last Answer : Only known some triads elements are identify from Dobereiner’s triads. Other triads did not obey Dobereiner’s rule. Hence, it is not useful.
Description : Why are transistors better than triads ?
Last Answer : Both triodes and transistors act as amplifiers. But due to the large size of the triode valve, there is a problem in installing it in the electronic device. This requires more energy ... and cooling system. But transistors do not have these problems. So transistors are better than triodes.
Description : What are 10 Pythagorean triads using whole numbers?
Last Answer : 3,4,5;9,40,41;6,8,10;5,12,13;30,40,50;90,120,150;10,24,26 Ithink that is 10 if not 300,400,500 and 20,48,52
Description : What are Dobereiner’s triads? Give example of 2 triads.
Last Answer : Ans: he arranged the elements in several sets of 3 elements .these sets were called triads which resembled with each other in chemical properties and atomic mass of the middle element was approx the mean of the atomic masses ... 35.5 +127)/2 =81.25 (ii) Calcium (40) ,strontium(88.5) and barium (137)
Description : Provide a suitable classification for resources on the basis of ownership. -SST 10th
Last Answer : (i) Classification for resources on the basis of ownership: (a) Individual resources (b) Community owned resources (c) National resources (d) International resources (i) ... to open ocean and no individual country can utilise these without the concurrence of international institutions.
Description : Briefly discuss the classification of plants giving suitable examples:
Last Answer : There are nearly half a million species of plants on the earth. With the exception of few , all of them need three basic ingredients to survive : air , light and water . Plants are found ... angiosperms include most other trees , the flowering plants, the grasses , crop plants , vegetable and weeds.
Description : State the classification of losses in pipe with suitable sketches and equations for each.
Last Answer : Major loss: The major loss of head is caused due to friction when fluid flow through a pipe. Minor loss: The minor loss of head is caused due to change in velocity of flowing fluid either in magnitude or ... . Loss of head due to obstruction. 6. Loss of head due to pipe fitting.
Description : Who is the man responsible for devising the modern science classification system?
Last Answer : Need answer
Description : According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the
Last Answer : eighth element starting from oxygen
Description : First attempt of classification of elements was made by
Last Answer : Dobereiner.c
Description : What is the significance of atomic number in the modern classification of elements?
Last Answer : In the modern classification, elements are arranged in the increasing order of their atomic numbers.
Description : What was the Mendeleev’s basis for classification of elements?
Last Answer : Mendeleev’s classification is based on atomic mass.
Description : The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. a) Calculate the average atomic mass of elements X and Z. b) How is the ... this example? d) Give another example of a set of elements which are classified according to this law.
Last Answer : a) The average atomic mass of X and Z = 7 39 2 46 2 23 b) The average atomic mass of X and Z is equal to the atomic mass of Y c) The law illustrated in this example is Dobereiner’s law of triads. d) Another example of Dobereiner’s law is Calcium, Strontium and Barium.
Description : Give reason: Classification of elements as metals and non-metals is justified but not satisfactory.
Last Answer : Classification of elements as metals and non-metals is justified because there are more common characteristics in both the groups but it is not satisfactory because each metal or non-metal have completely different properties.
Description : Give reason: Classification of elements on the basis of states of matter cannot be justified.
Last Answer : Classification on the basis of states of matter cannot be justified because for example bromine and mercury are liquids at room temperature, they cannot be placed in the same group.
Description : What is the need for periodic classification of elements?
Last Answer : When elements are classified such that they have the same properties, study of large number of elements is reduced to study of few groups of elements.
Description : Ch 5 – Periodic Classification of Elements
Last Answer : Ch 5 – Periodic Classification of Elements notes
Description : where can you find a listing of specific information elements that identify their classification, reason for classification, downgrading, and declassification information?
Last Answer : When derivatively classifying information, where can you find a listing of specific information elements that identify their classification, reason for classification, downgrading, and declassification ... InformationDoD 5220.22-M, National Industrial Security Program Operating Manual (NISPOM)
Description : When derivatively classifying information, where can you find a listing of specific information elements that identify their classification, reason for classification, downgrading, and declassification information?
Description : Name the scientists who made the classification of elements in the nineteenth century.
Last Answer : Name the scientists who made the classification of elements in the nineteenth century.
Description : What was the basis of classification of elements before the knowledge of electronic structure of atom?
Last Answer : What was the basis of classification of elements before the knowledge of electronic structure of atom?
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 : Name the 5 elements of the periodic classification wh comprise the Carbon Group.
Last Answer : ANSWER: CARBON, SILICON, GERMANIUM, TIN AND LEAD
Description : What is the science of classification?
Last Answer : science can be BROADLY classified into chemistry physics nBiology.
Description : Taxonomy is a science that deals with (1) Morphology (2) Anatomy (3) Classification (4) Economic uses
Last Answer : (3) Classification Explanation: Taxonomy is the academic discipline of defining groups of biological organisms on the basis of shared characteristics and giving names to those groups. Each group is ... aggregated to form a super group of higher rank and thus create a hierarchical classification.
Description : Which one of the following statements aptly define the term Taxonomy ? a. Branch of science concerned with classification, especially of organisms. b. Study which deals with emotional ... reproduction in cattle. d. Branch of zoology concerned with habitat preference among nocturnal organisms.
Last Answer : a. Branch of science concerned with classification, especially of organisms.
Description : Which one of the following statements aptly define the term Taxonomy ? a. Branch of science concerned with classification, especially of organisms. b. Study which deals with emotional ... reproduction in cattle. d. Branch of zoology concerned with habitat preference among nocturnal organisms
Last Answer : Classification
Description : Assurance engagements should exhibit the following elements except a. A subject matter b. Suitable criteria c. Evidence d. Appropriate professional fees
Last Answer : Appropriate professional fees
Description : You have to sort a list L, consisting of a sorted list followed by a few ‘random’ elements. Which of the following sorting method would be most suitable for such a task ? (A) Bubble sort (B) Selection sort (C) Quick sort (D) Insertion sort
Last Answer : (D) Insertion sort
Description : A current asset is a. the last asset purchased by a business. b. an asset which is currently being used to produce a product or service. c. usually found as a separate classification in the income statement. d. an asset that a company expects to convert to cash or use up within one year.
Last Answer : d. an asset that a company expects to convert to cash or use up within one year.
Description : Q1. What are the desirable characters of bee varieties suitable for honey production? -Science
Last Answer : The variety of bee should yield large amount of honey. The bees should stay for a longer period in bee hives The bees should not sting much. Bee should be disease resistant.
Description : Discuss with your teacher what does ‘a suitable gene’ means, in the context of DNA vaccines. -Science
Last Answer : A DNA vaccine consists of a suitable gene encoding an antigenic protein, inserted into a plasmid, and then incorporated into the cells in a target animal. The plasmid vaccine carrying the DNA (gene ... on their surface, the immune system is alerted, which then triggers a range of immune responses.
Description : The branch of science which deals with the treatment of diseases using suitable chem- icals is known as?
Last Answer : chemotherapy