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प्रश्न
Moseley’s periodic table is based on atomic mass.
पर्याय
True
False
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उत्तर
False
Correct Statement: Moseley’s periodic table is based on atomic number.
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संबंधित प्रश्न
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.
(a) How is possible valency of an element determined from the electronic configuration of its atom ?
(b) Determine the valency of an element X whose atomic number is 15.
Why was this basis of classification discarded for future classification of elements?
Among the given species A–, A+, and A, the smallest one in size is ______.
An atom of an element has the electronic configuration 2,8,2. To which group does it belong?
In which group are inert elements placed?
Identify and name the metals out of the following elements whose electronic configurations are given below.
- 2, 8, 2
- 2, 8, 1
- 2, 8, 7
- 2, 1
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?
How are elements grouped into various families in the periodic table?
Element 'X' forms an oxide with the formula X2O3 which is a solid with high melting point. ‘X’ would most likely be placed in the group of the Periodic Table as:
