Arrange the following in a hierarchical manner based on the period of their evolution.
Homoerectus, Ramapithecus, Australopithecus, Homosapiens, Neanderthal man
Arrange the following in a hierarchical manner based on the period of their evolution.
Homoerectus, Ramapithecus, Australopithecus, Homosapiens, Neanderthal man
Homoerectus, Ramapithecus, Australopithecus, Homosapiens, Neanderthal man
Text Solution
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Ramapithecus `to` Australopithecus `to` Homoerectus `to` Neanderthal man `to` Homosapiens
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On which of the following facts does the method of periodic abstinence is based ?
Read the following paragraph and answer the questions given below: In the Modem Periodic table, the elements are arranged in the increasing order of their atomic numbers . Thi s arrangement is based on the Modern Periodic law, which states that the properties of elements are a periodic function of their atomic numbers. In the Modern Peroidic table, each column is called a group and each row is called a period. Elements within the same group show similarity and ggradation in properties. This is due to the same number of electrons in the outermost shell. State the law on which mode,n periodic table is based.
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Convert sequence of stagess in evolution of modern man/Homosapien sapien.
Convert sequence of stagess in evolution of modern man/Homosapien sapien.
A
Australopithecus, Neanderthal man, Cro-Magnon man, Homo erectus and Modern man
B
Austalopithecus, Homo erectus, Neanderthal man, Cro-Magnon man and Modern man
C
Homo erectus, Neanderthal man, Australopithecus, Cro-Magnon man and Modern man
D
Homo erectus, Australopithecus, Neanderthal man, Cro-Magnon man and Modern man
Which of the following statement (s) about the Modern Periodic Table is are incorrect (i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number (ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses (iii) Isotopes are placed in adjoining group (s) in the Periodic Table (iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number
Which of the following statement (s) about the Modern Periodic Table is are incorrect (i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number (ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses (iii) Isotopes are placed in adjoining group (s) in the Periodic Table (iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number
A
(i) only
B
(i),(ii) and (iii)
C
(i),(ii) and (iv)
D
(iv) only
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Read the following paragraph and answer the questions given below: In the Modem Periodic table, the elements are arranged in the increasing order of their atomic numbers . Thi s arrangement is based on the Modern Periodic law, which states that the properties of elements are a periodic function of their atomic numbers. In the Modern Peroidic table, each column is called a group and each row is called a period. Elements within the same group show similarity and ggradation in properties. This is due to the same number of electrons in the outermost shell. How many groups are there in the modem periodic table?
Read the following paragraph and answer the questions given below: In the Modem Periodic table, the elements are arranged in the increasing order of their atomic numbers . Thi s arrangement is based on the Modern Periodic law, which states that the properties of elements are a periodic function of their atomic numbers. In the Modern Peroidic table, each column is called a group and each row is called a period. Elements within the same group show similarity and ggradation in properties. This is due to the same number of electrons in the outermost shell. What is the trend in the variation of valency while going down a group?
Read the following paragraph and answer the questions given below: In the Modem Periodic table, the elements are arranged in the increasing order of their atomic numbers . Thi s arrangement is based on the Modern Periodic law, which states that the properties of elements are a periodic function of their atomic numbers. In the Modern Peroidic table, each column is called a group and each row is called a period. Elements within the same group show similarity and ggradation in properties. This is due to the same number of electrons in the outermost shell. Which pair of elements do you think will have similar properties? (a) Sodium and Argon (b) Sodium and Potassium (c) Potassium and Neon
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Atom of seven elements A,B ,C, D, E,F and G have a different number of electronic shells but have the same number of electrons in their outermost shells. The element A and C combine with chlorine to form an acid and common salt respectively. The oxide of element A is liquid at room temperature and is a neutral substance while the oxides of the remaining six elements are basic in nature . Based on the above information, anwer the following question given ahead : Will element A to G belong to the same period or same group of the periodic table ?
Read the following paragraph and answer the questions given below: Dmitri Ivanovich Mendeleev was the first to classify elements on the basis of their fundamental property, the atomic mass, and also on the similarity of chemical properties. When Mendeleev started his work, 63 elements were known. He examined the relationship between the atomic masses of the elements and their physical and chemical properties. Among chemical properties Mendeleev concentrated on the compounds formed by the elements with oxygen and hydrogen. He selected hydrogen and oxygen as they were very reactive and formed compounds with most elements . The formulae of the hydrides and oxideswere treated as one of the basic properties of an element for its classification. He sorted out the elements with similar properties and pinned the cards together on a wall. He observed that most of the elements got a place in the periodic table and were arranged in the order of their increasing atomic masses. It was also observed that there occurs a periodic recurrence of elements with similar physical and chemical properties . On this basis Mendeleev formulated a periodic law which states that "The properties of the elements are the periodic function of their atomic masses". What is meant by periodicity according to Mendeleev?