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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.
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
Give two example of group 17 elements.
What is the name of those elements which divide metals and non-metals in the periodic table?
What is a period in a periodic table?
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
Name two elements in each case:
Actinides
Give the symbol and valency of the following element and radical.
Magnesium
What is the symbol of the element Tungsten?
State the group and period, of the element having three shells with three electrons in valence shell.
