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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
Why do all the elements of the same group have similar properties?
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
Explain why, the noble gases are placed in a separate group.
The three elements having chemical symbols of Si, B and Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids
(d) Si is metalloid, B is metal and Ge is non-metal
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.
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
What is a group in the periodic table?
What are the advantages of the periodic table?
What are the groups in a periodic table? Give two characteristics of each.
Give the group number of following elements present in periodic table
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
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 two outermost shell incomplete.
Name the type of elements which have one electron short of octet.
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Name an alkali metal in period 3 and halogen in period 2.
Name the noble gas with 3 shells.
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Bisulphate
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Write an explanation.
Period
What are groups and periods in the modern periodic table?
The inert gas which lies in the third period is ______
Which of the following statements about the Modern Periodic Table is correct:
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
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 same valency as Lithium.
Define periods of modern periodic table.
An element with atomic number ______ will form a basic oxide.
Select the appropriate options and complete the following paragraph:
(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).
On the basis of electronic configuration, elements in the modern periodic table are classified Into ______ blocks. Groups 1 and 2 elements are included in ______ and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in ______. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in ______ and all the elements are ______ elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute ______ and all these elements are metals.
Match the atomic number with the following:
A rare gas.
