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प्रश्न
Which of the following statements about the Modern periodic table is correct?
पर्याय
18 horizontal rows are known as Periods.
7 vertical columns are known as Periods.
18 vertical columns are known as groups.
7 horizontal rows are known as groups.
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उत्तर
18 vertical columns are known as groups.
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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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−
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|
−
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A
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|
−
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−
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B
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C
|
(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?
How does the metallic character of elements in Modern Periodic Table vary on moving from left to right in a period, and (ii) down a group?Give reason to justify your answer.
Give two example of group 1 elements.
Give two example of group 18 elements.
Which element has two shells, both of which are completely filled with electrons?
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
State how the valency of elements varies in a period of the periodic table?
On the basis of electronic configuration, how will you identify chemically similar elements?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
Name two elements in Alkali metals.
Name two elements in Alkaline earth metals.
Name two elements in each case: Lanthanides
Name the type of elements which have outermost shell incomplete.
Name an alkali metal in period 3 and halogen in period 2.
An element E has following electronic configuration:
|
K |
L |
M |
|
2 |
8 |
6 |
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.
Write a short note.
Structure of the modern periodic table.
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
What is meant in the periodic table by a period?
The horizontal rows in a periodic table are called _____.
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Hydroxide
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of sodium sulphite
Give the chemical formula of carbonic acid
State the number of elements in Period 1 of the Periodic Table.
The d-block elements are called as _______ elements.
Find the odd one out and give its explanation.
The modern periodic table is divided into which blocks?
Explain structure of modern periodic table in short.
Noble gases belong to______ group of the periodic table.
On moving from left to right in a period in the periodic table, the size of the atom ______
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Which of the following elements does not lose an electron easily?
Spot the error:
The elements of group 13 are called the carbon family.
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
An element with atomic number ______ will form a basic oxide.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
Match the atomic number with the following:
An element of group 2.
