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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
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
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.
Fill in the following blank with suitable word:
Group 18 elements are called ...............
Name the scientist who prepared modern periodic table.
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
What is a period in a periodic table?
What are the periods in a periodic table? Give two characteristics of each.
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 scientist who stated the modern periodic law.
Name two elements in Alkali metals.
Name the type of elements which have two outermost shell incomplete.
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
Answer the following in respect of element `31/15 P`
Give its electronic configuration
State the main aim of classifying elements. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table? Name and state the law based on this fundamental property. On which side of the periodic table one can find metals, non-metals and metalloids?
What is the number of elements in the 1st period?
Name an element of group 18 which can form compounds.
The horizontal rows in a periodic table are called _____.
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Hydroxide
State what is meant by the term chemical formula.
What are the elements.
What are the periods in a periodic table?
The groups 1 and 2 constitute the _______ block.
To the left of the zig-zag line in the periodic table are the metal elements.
Write an Explanation.
Period
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
Explain structure of modern periodic table in short.
Noble gases belong to______ group of the periodic table.
______ forms the basis of the modern periodic table.
The arrangement of elements in the Modem Periodic Table is based on their ______
The element which has the least tendency to lose electrons is ______
Which one of the following elements exhibit maximum number of valence electrons?
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
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:
A and F
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
