In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
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What is modern periodic law? How does it in the removal of some of the anomalies of the Mendeleev’s periodic table?
Modern Periodic law states that “the physical and chemical properties of the elements are periodic functions of their atomic numbers”. When atomic number is taken as fundamental property then abnormalities...
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What are inner transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements:
Inner transition metals are those elements in which the last electron enters the f-orbital. The elements in which the 4f and the 5f orbitals are progressively filled are called f-block...
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How many groups and periods are there in the Modern Periodic Table? How do the atomic size and metallic character of elements vary as we move:
There are 18 groups and 7 periods in the Modern Periodic Table. (a) * Atomic size increase * Metallic character increases (b) * Atomic size decreases * Metallic character decreases
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Four elements P, Q, R and S belong to the third period of the Modern Periodic Table and have respectively 1,3, 5 and 7
Electronic configuration of Q : 2, 8, 3 Valency of Q: 3 Electronic configuration of R: 2, 8, 5 Valency of R: 8-5=3 P + S ----> PS 2,8,1 2,8,7
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Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. Why?
The properties of elements depend upon valence electrons in the atom which in turn depends on the total number of electrons, i.e., atomic number. Therefore, atomic number is a more appropriate parameter...
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Two elements with symbol X (atomic no. 16) and Y (atomic no. 12) are placed in the III period of the Modern Periodic Table.
(i) Y (ii) 2 each (ii) False, same period but Y lies in group 2 and X in group 16. So, as we mover from left to right size decreases with increase in...
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Marble contains ,(A) calcium hydroxide (B) calcium chloride (C) calcium carbonate (D) calcium oxide
(C) calcium carbonate Marble contains calcium carbonate and its chemical formula is CaCO3.
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Differentiate between the arrangement of elements in Mendeleev's periodic table and the modern periodic table.
Mendeleev’s Periodic Table Modern Periodic Table Mendeleev's periodic table is based on atomic mass. Elements are arranged in increasing order of their atomic masses. Modern periodic table is based on atomic number. Elements are arranged...
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Differentiate between the arrangement of elements in Mendeleev’s periodic table and Modern periodic table.
Mendeleev’s periodic table Modern periodic table. ...
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State Modern Periodic Law. What is number of groups and periods in the Modern Periodic Table?
Modern Periodic Law states that properties of elements are a periodic function of their atomic number. In Modern Periodic Table there are18 groups and 7 periods.
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