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प्रश्न
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:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
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उत्तर
If the electronic configuration of aluminium is 2, 8, 3, then 3 electrons are there in the outer shell of thallium.
संबंधित प्रश्न
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
What is the number of elements is 1st period the modern periodic table?
Name two elements in halogens.
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
Give the symbol and valency of the following element and radical.
Hydroxide
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
Match the atomic number with the following:
An element of group 2.
