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प्रश्न
What are horizontal rows and vertical columns in a periodic table known as?
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उत्तर
The horizontal rows are known as periods and vertical columns in the periodic table are known as groups.
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संबंधित प्रश्न
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
Consider the following elements:
20Ca, 8O, 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be:
(i) very stable?
(ii) in group 2 of the periodic table?
(iii) in group 16 of the periodic table?
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Ammonium
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
The element which has the least tendency to lose electrons is ______
The amount of energy released when one or more electrons is added to the neutral atom is ______
An element has 2 electrons in its N shell.
State its position in periodic table.
