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Molecular formula of Some Chemical Compounds
Compound name Molecular weight Molecular formula 1 Acetic acid 60.052 g/mol CH3COOH 2 Hydrochloric acid 36.458 g/mol HCl 3 Sulfuric...
Vikas Yadav
Sep 20, 20207 min read
Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Period
Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table. Solution: Mendeleev’s...
Vikas Yadav
Sep 5, 20201 min read
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbe
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these...
Vikas Yadav
Sep 5, 20201 min read
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Tabl
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration...
Vikas Yadav
Sep 5, 20201 min read
An atom has electronic configuration 2, 8, 7. (a) What is the atomic number of this element? (b) To
An atom has electronic configuration 2, 8, 7. (a) What is the atomic number of this element? (b) To which of the following elements would...
Vikas Yadav
Sep 5, 20201 min read
3. Name (a) Three elements that have a single electron in their outermost shells. (b) Two elements t
3. Name (a) Three elements that have a single electron in their outermost shells. (b) Two elements that have two electrons in their...
Vikas Yadav
Sep 5, 20201 min read
What were the criteria used by Mendeleev in creating his Periodic Table?
What were the criteria used by Mendeleev in creating his Periodic Table? Solution: Mendeleev concentrated on various compounds formed by...
Vikas Yadav
Sep 5, 20201 min read
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (Any two) Solution:...
Vikas Yadav
Sep 5, 20201 min read
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: K,
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: K, C, AI, Si, Ba. Solution: K- K2O...
Vikas Yadav
Sep 5, 20201 min read
What were the limitations of Dobereiner’s classification?
Solution: (i) They were not applicable for very low mass or very high mass elements. (ii) All the elements couldn’t fit into Dobereiner’s...
Vikas Yadav
Sep 5, 20201 min read
Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
Solution: Dobereiner’s triads did exist in the columns of Newlands’ Octaves; For example, the elements Lithium (Li), Potassium (K) and...
Vikas Yadav
Sep 5, 20201 min read
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