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प्रश्न
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.
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उत्तर
On the basis of electronic configuration, elements in the modern periodic table are classified Into four blocks. Groups 1 and 2 elements are included in s-block and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in p-block. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in d-block and all the elements are metals elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute f-block and all these elements are metals.
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
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.
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
State modern periodic law.
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
Fill in the following blank with suitable word:
Group 1 elements are called ...............
What is meant by a group, in a periodic table?
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
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
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
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
(b) What is the number of elements is 3rd period, the modern periodic table?
What is a group in the periodic table?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
What are the advantages of the periodic table?
What are the groups in a periodic table? Give two characteristics of each.
How many groups and periods does the modern periodic table have?
Name the type of elements which have outermost shell complete.
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
Name an alkali metal in period 3 and halogen in period 2.
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
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
Define the atomic size.
Give the chemical formula of carbonic acid
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
What are the elements.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Write an Explanation.
Period
Explain structure of modern periodic table in short.
What are groups and periods in the modern periodic table?
______ is the longest period in the periodical table.
The inert gas which lies in the third period is ______
Compare the radii of two species X and Y. Give reasons for your answer.
- X has 12 protons and 12 electrons
- Y has 12 protons and 10 electrons
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
An element with atomic number ______ will form a basic oxide.
1H2 is an isotope of hydrogen. In the modern Periodic Table it will ______.
