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प्रश्न
Distinguish between:
Group 17 - Group 18
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उत्तर
| Sr. No. | Group 17 | Group 18 |
| 1. | Elements of group 17 are called halogens. | Elements of group 18 are called inert gas elements or noble gases. |
| 2. | They have seven valence electrons. | They have eight valence electrons, except helium, which contains 2 electrons. |
| 3. | Their valency is 1. | Their valency is zero. |
| 4. | They form diatomic molecules with the general formula (X2). | They are monoatomic gases under normal conditions. |
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संबंधित प्रश्न
In the Modern Periodic Table, which are the metals among the first ten elements?
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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A
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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 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.
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
State modern periodic law.
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.
Which element has two shells, both of which are completely filled with electrons?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
Explain why all the elements of a group have similar chemical properties.
What is the number of elements is 1st period the modern periodic table?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
(i) A and D
(ii) C and D
(iii) A and B
(iv) B and C
(v) A and C
How many groups and periods does the modern periodic table have?
Name two elements in halogens.
Name two elements in each case:
Transition element
What do you understand by typical elements?
Name the type of elements which have one electron short of octet.
Answer the following in respect of element `31/15 P`
Give its electronic configuration
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Name an alkali metal in period 3 and halogen in period 2.
From the standpoint of atomic structure, what determines which elements will be the first and which the last in a period of the periodic table?
Give the symbol and valency of the following element and radical.
Hydrogen
Give the chemical formula of carbonic acid
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Find the odd one out and give its explanation.
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
Elements in the modern periodic table are arranged in ______groups and______ periods.
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Spot the error:
The elements of group 13 are called the carbon family.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
Explain the position of hydrogen in the periodic table.
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:
E and B
Define groups of modern periodic table.
Name the non-metals in the first twenty elements.
Give reason for the following:
Inert gases do not form ion.
