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प्रश्न
What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?
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उत्तर
The elements at the end of the period have 8 electrons in the valence shell.
Ne = 2, 8
Ar = 2, 8, 8
संबंधित प्रश्न
Which element has twice as many electrons in its second shell as in its first shell?
Match the atomic number 2, 4, 8, 15 and 19 with each of the following:
- A solid non-metal belonging to the third period.
- A metal of valency 1.
- A gaseous element with valency 2.
- An element belonging to Group 2.
- A rare gas.
How does the number of valence electrons vary on moving from left or right in the first period of the periodic table?
Name the element which is in first group and third period.
Fill in the blank in the following statement:
The tendency to gain an electron ............... on moving down in a group of the periodic table.
Where would you locate the element with electronic configuration 2, 8 in the modern periodic table?
What do you understand by orbits?
State the number of elements in period 1, period 2 and period 3 of the periodic table.
Write the electronic configuration of element 17T35.
- What is the group number of T?
- What is the period number of T?
- How many valence electrons are there in an atom of T?
- What is the valency of T?
- Is it a metal or non-metal?
- State number of protons and neutrons in T.
Give a reason for the following:
A transition from metallic to non-metallic elements is seen on moving from left to right in a period of the periodic table.
