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प्रश्न
Find the correlation:
Group 1 and 2 : s block : : group 13 and 18 : ______
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उत्तर
Group 1 and 2 : s block : : group 13 and 18 : p Block
Explanation:
The modern periodic table is divided into blocks based on the orbital being filled by the valence electrons:
- s-block: Includes Groups 1 and 2, where the last electron enters the s-orbital.
- p-block: Includes Groups 13 to 18, where the last electron enters the p-orbital.
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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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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?
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
How many rows and columns are there in the modern periodic table?
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
What is meant by a group, in a periodic table?
Explain why, the noble gases are placed in a separate group.
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:
(a) electron
(b) proton
(c) neutron
(d) meson
What is the usual number of valence electrons in the atoms of the last element in a period?
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
What is the number of elements is 1st period the modern periodic table?
What are the merits of the modern periodic table of elements?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
What are the advantages of the periodic table?
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.
(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
Name the metals in the first twenty elements.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
Name an alkali metal in period 3 and halogen in period 2.
How many periods and groups are there in the modern periodic table?
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Bisulphite
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of magnesium nitrate
Give the chemical formula of ammonium sulphate
Give the chemical formula of calcium phosphate
State the number of elements in Period 2 of the Periodic Table.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Find the odd one out and give its explanation.
p-block is composed of groups 1 and 2.
Write an explanation.
Period
Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
Which of the following is the outermost shell for elements of period 2?
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
Match the atomic number with the following:
A rare gas.
