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प्रश्न
An element A has 2 electrons in its fourth shell. State its electronic configuration.
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उत्तर
Its electronic configuration is 1s22s22p63s23p64s2.
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संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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−
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A
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−
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B
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C
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(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
Name two elements in each case: Lanthanides
Name the type of elements which have two electrons in the outermost orbit.
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Which of the following statements about the Modern periodic table is correct?
Mendeleev's periodic table : atomic mass : : Modern periodic table : _______
Find the odd one out and give its explanation.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
Match the atomic number with the following:
A rare gas.
