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प्रश्न
A metal M forms as oxide having the formula M2O3. It belongs to third period. Write the atomic number and valency of the metal.
उत्तर
Period no. = no. of shells, so n = 3
From the formula M2O3 its valency is 3.
Since it is a metal, its valence shell has 3 electrons.
So its electronic configuration is 2, 8, 3
Atomic number = 13
Hence the metal is Aluminum with valency 3.
संबंधित प्रश्न
Name the periodic property which relates to the character of element which loses one or more electrons when supplied with energy.
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Select the correct answer
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On moving down the group metallic character increases.
Write scientific reason.
The metallic character of elements increases while going down the groups.
3, 1, 2 electrons are in valence shells of X, Y, Z elements. From this information, state the group in which they belong and write their valencies.
An element has atomic number 17. To which group, the period does it belong? It is metal or non-metal?
Choose the odd one out and write the reason:
Choose the odd one out and write the reason:
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.
