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प्रश्न
Define the term : Atomic size
उत्तर
Atomic size:-
Atomic size or atomic radius is the distance between the centre of the nucleus and the outermost shell of an isolated atom.
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संबंधित प्रश्न
Match the atomic number 2, 4, 8, 15 and 19 with each of the following
1) A solid non metal belonging to the third period.
2) A metal of valency 1.
3) A gaseous element with valency 2.
4) An element belonging to Group 2
5) A rare gas.
How does the atomic size vary on going down from top to bottom in a group of the periodic table? Why does it vary this way?
State the valency of the elements of periods 3 and write the formula of their oxides.
F, Cl and Br are the elements each having seven valence electrons. Which of these (i) has the largest atomic radius, (ii) is most reactive? Justify your answer stating reason for each.
Fill in the blank
There are ______ groups and ______ periods in the modern form of periodic table.
'In a group, the atomic radii increase with increasing period number', explain this statement and justify it with reference to group 17.
Atomic numbers of elements A, B, C, D, E, F are 8, 7, 11, 12, 13 and 9 respectively. State the type of ions they form.
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.
Name and state the following with reference to the elements of the first three periods of the periodic table.
Metalloid in Period 3.
Name or state following with reference to the element of the first three periods of the periodic table.
A covalent compound formed between an element in period 1 and a halogen.
