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प्रश्न
Find the correlation:
Mendeleev’s periodic table : atomic mass : : Modern periodic table : _______
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उत्तर
Mendeleev’s periodic table : atomic mass : : Modern periodic table : atomic number
Explanation:
Mendeleev organised his periodic table based on the atomic mass of elements. In contrast, the modern periodic table is based on the atomic number (the number of protons), which Henry Moseley demonstrated to be a more fundamental property for predicting periodic trends in chemical behaviour.
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संबंधित प्रश्न
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 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.
Give two example of group 17 elements.
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
The modern periodic table was prepared by ______.
What is the usual number of valence electrons in the atoms of the last element in a period?
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 are the periods in a periodic table? Give two characteristics of each.
The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here not the chemical symbols of the elements):
| a 3 |
b 4 |
c 5 |
d 6 |
e 7 |
f 8 |
g 9 |
h 10 |
|
| i 11 |
j 12 |
k 13 |
l 14 |
m 15 |
n 16 |
o 17 |
p 18 |
(i) Which element has a bigger atom, a or f?
(ii) Which element has a higher valency, k or o?
(iii) Which element is more metallic i or k?
(iv) Which element is more non-metallic, d or g?
(v) Select a latter which represents a metal of valency 2.
(vi) Select a letter which represents a non-metal of valency 2.
The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
(i) A and D
(ii) C and D
(iii) A and B
(iv) B and C
(v) A and C
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 _________
Name two elements in each case:
Transition element
Name the type of elements which have two outermost shell incomplete.
Name the type of elements which have two electrons in the outermost orbit.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
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
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.
Hydrogen
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the symbol and valency of the following element and radical.
Bisulphite
Give the symbol and valency of the following element and radical.
Sulphate
Give the chemical formula of sodium hydroxide
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Find the odd one out and give its explanation.
Right or wrong sentence.
To the left of the zig-zag line in the periodic table are the metal elements.
Complete the following flow chart.
Noble gases belong to______ group of the periodic table.
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.
Identify gas A in the following experiment.
The longest period of the Modern Periodic Table is period.
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
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 variable valency and is a member of the Oxygen family (group 16).
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.
State the group and period, of the element having three shells with three electrons in valence shell.
Name the non-metals in the first twenty elements.
Answer the following in respect of element \[\ce{_16^32S}\].
To which group and period does it belong?
