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प्रश्न
The modern periodic table shows the molecular masses of the elements in each frame.
पर्याय
Right
Wrong
उत्तर
The modern periodic table shows the molecular masses of the elements in each frame- Wrong
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संबंधित प्रश्न
What is periodicity in properties of elements with reference to the Modern Periodic Table?
Why do all the elements of the same group have similar properties?
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
What is the usual number of valence electrons in the atoms of the last element in a period?
What is a period in a periodic table?
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
What are the merits of the modern periodic table of elements?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
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.
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 halogens.
State its position in the periodic table?
Answer the following in respect of element `31/15 P`
Give its electronic configuration
What is the main characteristic of the last element in each period of the periodic table?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Name the noble gas with 3 shells.
Write a short note.
Structure of the modern periodic table.
What is the number of elements in the 1st period?
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the symbol and valency of the following element and radical.
Bicarbonate
Give the symbol and valency of the following element and radical.
Carbonate
Give the chemical formula of ammonium sulphate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
Write an Explanation.
Period
Identify gas A in the following experiment.
Element ‘X’ forms a chloride with the formula XCl2, which is solid with a high melting point. X would most likely be in the same group of the periodic table as: ______
Which of the following statements about the Modern Periodic Table is correct:
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
______ group elements are called alkaline earth metals.
Spot the error:
The elements of group 13 are called the carbon family.
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
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
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:
E and B
An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.
Answer the following in respect of element \[\ce{_16^32S}\].
To which group and period does it belong?
Match the atomic number with the following:
A rare gas.
Give reason for the following:
Inert gases do not form ion.
