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प्रश्न
Give a reason why elements need to be properly classified.
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उत्तर
Reason of classification of elements:
- It makes the study of elements in an organized manner.
- To help and correlate the properties of elements with the fundamental properties of different states of matter.
- To help to define the relationship of one element with others.
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संबंधित प्रश्न
The element which forms a basis oxide has the atomic number of:
(a) 18
(b) 17
(c) 14
(d) 19
A metal X is in the first group of the periodic table. What will be the formula of its oxide?
In which block of the modern periodic table are the nonmetals found?
Which of the following have inert gases 2 electrons in the outermost shell.
Moseley’s periodic table is based on atomic mass.
The atom of an element has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar?
Element ‘A’ has electronic configuration 2, 7; ‘B’ has electronic configuration 2, 8, 5 and ‘C’ has electronic configuration 2, 8, 7. Which two elements will exhibit similar chemical properties?
An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell.
- Identify the element X. How many valence electrons does it have?
- Draw the electron dot structure of the diatomic molecule of X. What type of bond is formed in it?
- Draw the electron dot structure for ammonia and what type of bond is formed in it?
Complete the following triads by inserting the missing elements.
Cl, ______, I
The atomic number of an element 'X' is 11.
- Write the electronic configuration of X and find its valency.
- Write the formula and nature of its oxide.
