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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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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?
How were the positions of cobalt and nickel resolved in the modern periodic table?
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
Explain why all the elements of a group have similar chemical properties.
What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
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
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Name two elements in halogens.
Name two elements in each case:
Transition element
Name two elements in each case:
Actinides
State the modern periodic law for the classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
State the modern periodic law.
What is meant in the periodic table by a period?
Two elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, respectively. Compare the following characteristics in the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
- Their metallic characters
- Formation of their oxides
- Formulae of their chlorides
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the symbol and valency of the following element and radical.
Bicarbonate
Give the symbol and valency of the following element and radical.
Nitrate
State what is meant by the term chemical formula.
p-block is composed of groups 1 and 2.
Write an explanation.
Period
Write a scientific reason.
Lithium and sodium are included in the same group in the periodic table.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
The element which has the least tendency to lose electrons is ______
On moving from left to right in a period in the periodic table, the size of the atom ______
An element which is an essential constituent of all organic compounds belongs to
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has a similar structure to diamond.
______ group elements are called alkaline earth metals.
Spot the error:
The elements of group 13 are called the carbon family.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
A and F
Define periods of modern periodic table.
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
Name the non-metals in the first twenty elements.
What is the general name of the last elements of the Periodic Table?
An element has 2 electrons in its N shell.
State its position in periodic table.
Match the atomic number with the following:
A rare gas.
