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प्रश्न
Complete the following flow chart.
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उत्तर
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संबंधित प्रश्न
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
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 many periods and groups are there in the long form of periodic table?
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
(a) P
(b) Q
(c) R
(d) S
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
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 usual number of valence electrons in the atoms of the last element in a period?
What are the merits of the modern periodic table of elements?
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 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.
Define:
Periodic table
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in Alkaline earth metals.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
What is the number of elements in the 1st period?
The horizontal rows in a periodic table are called _____.
Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
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.
Sulphur [Sulphide]
Give the chemical formula of ammonium sulphate
Give the chemical formula of carbonic acid
The d-block elements are called as _______ elements.
Group 13 to 18 : p block : : _______ : d block
Find the odd one out and give its explanation.
To the left of the zig-zag line in the periodic table are the metal elements.
Write an Explanation.
Period
Explain structure of modern periodic table in short.
Elements in the modern periodic table are arranged in ______groups and______ periods.
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
______ is the longest period in the periodical table.
What is the symbol of the element Tungsten?
Which of the following elements does not lose an electron easily?
Match the atomic number with the following:
An element of group 2.
