The atomic number of an element 'X' is 20.
(i) Determine the position of the element 'X' in the periodic table.
(ii) Write the formula of the compound formed when'X'reacts/combines with another element 'Y'(atomic number 8).
(iii) What would be the nature (acidic or basic) of the compound formed?Justify your answer.
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Calculate the atomic number of an element whose mass number is 31 and number of neutrons is 13. What is the symbol of the element?
We know that, mass number = Number of protons + Number of neutrons But number of protons is equal to the atomic number. ∴ Mass number = Atomic number + number of...
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How does the electronic configuration of an atom of an element relate to its position in the modern periodic table ?
The position of elements depends upon number of valence electrons which depend upon electronic configuration. Those elements which have same valence electrons, occupy same group. Those elements which have one valence...
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An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason :
Position of P Group-2 Because it has 2 valence electrons/ 2, S, 8, 2 Period-4 Because it has 4 shells/2,8,8,2 Position of Q Croup-17 Because it has 7 valence electrons/ 2, 8, 7 Period-3 Because it has 3 shells/...
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Write down five major differences between Mendeleev's. Periodic table and Modern Periodic Table.
S. No. Mendeleev's Period Table Modern Periodic Table (i) Elements have been arranged in increasing order of atomic masses. Element have been arranged in increasing order of their atomic number. (ii) It consists of 8 groups. It consists of 18 groups. (iii) All the groups from...
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Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table.
(i) Nitrogen: K shell-2 L shell-5 Phosphorus: K shell-2 L shell - 8 M shell-5 (ii) Phosphorus will be less electronegative because its elections are further...
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Why is atomic number considered to be a more appropriate parameter than atomic mass for the classification of elements in a periodic table ?
Atomic number is more important parameter than atomic mass as atomic number determines the number of valence electrons which decide the chemical properties of an atom of an element. Metallic character decreases from left...
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An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.
(i) The position of elements X in the modern periodic table is group number 17 and period number 3. The position of element Y in the modern periodic table is...
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Using the given part of the periodic table, answer the following questions with reason: (i) Name the element having smallest atomic size.
(i) Element -E (ii) k=2,l=8,M=6 (iii) X and Z.
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The period number in the long form of the periodic table is equal to (i) magnetic quantum number of any element of the period.
(iii) maximum Principal quantum number of any element of the period.
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In what manner is the long form of periodic table better than Mendeleev’s periodic table? Explain with examples.
Superiority of the Long form of the Table over Mendeleev’s Table: (i) This table is based on a more fundamental property, i.e., atomic number. (ii) It correlates the position of the elements...
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