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प्रश्न
The K and L shells of the elements Na and Mg contain electrons.
विकल्प
Right
Wrong
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उत्तर
The K and L shells of the elements Na and Mg contain electrons- Right
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
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?
What is meant by a period, in a periodic table?
Give two example of group 18 elements.
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
The modern periodic table was prepared by ______.
How would the tendency to lose electrons change as we go from left to right across a period of the 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?
Explain why All the elements of a group have similar chemical properties.
State how the valency of elements varies in a group of the periodic table?
State how the valency of elements varies in a period of the periodic table?
What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
What is a group in 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
Name two elements in halogens.
Name two elements in Inert gas.
Name two elements in each case:
Transition element
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
Name the noble gas with 3 shells.
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?
State the modern periodic law.
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
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.
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.
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
Write scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
Explain structure of modern periodic table in short.
Which of the following statements about the Modern Periodic Table is correct:
An element which is an essential constituent of all organic compounds belongs to
Which of the following is the outermost shell for elements of period 2?
Which of the following elements would lose an electron easily?
Which of the following elements will form an acidic oxide?
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
Define groups of modern periodic table.
An element with atomic number ______ will form a basic oxide.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
Answer the following in respect of element \[\ce{_16^32S}\].
To which group and period does it belong?
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
