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प्रश्न
Why was this basis of classification discarded for future classification of elements?
उत्तर
Basis of rejection:
- Some characteristics being considered, varied under different conditions.
- Certain elements resembled metallic as well as non-metallic both.
- It did not serve the purpose of classification.
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संबंधित प्रश्न
An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason:
Write the position of P and Q in the Modern Periodic Table and the molecular formula of the compound formed when P reacts with Q.
Rewrite the following statement after correction, if necessary:
Groups have elements with consecutive atomic numbers.
Rewrite the following statement after correction, if necessary:
Isotopes are the elements of the same group.
The element X forms a compound X2Y. Suggest an element that Y might be and give reasons for your choice.
An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting.
(a) How many electrons would be there in the outermost shell of the element X?
(b) To which group of the periodic tables does the element X belong?
(c) Write the formula of the compound formed when X reacts with chlorine.
Write the names and symbols of two very reactive metals belonging to group 1 of the periodic table. Explain by drawing electronic structure, how either one of the two metals reacts with a halogen. With which name is the bond formed between these elements known and what is the class of the compound so formed known? State any four physical properties of such compounds.
Choose the correct option and rewrite the statement.
The number of electrons in the outermost shell of alkali metals is _______.
Which of the following have inert gases 2 electrons in the outermost shell.
In which group are inert elements placed?
Complete the following triads by inserting the missing elements.
Li, ______, K
