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प्रश्न
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
विकल्प
Right
Wrong
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उत्तर
The given sentence is wrong.
Explanation:
The modern periodic table shows each element’s atomic number (and often its atomic/relative atomic mass) in the cell; it does not show a “molecular mass”. Elements have atomic masses; “molecular mass” refers to compounds (molecules).
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संबंधित प्रश्न
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
Fill in the following blank with suitable word:
Group 18 elements are called ...............
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
What is the name of those elements which divide metals and non-metals in the periodic table?
Explain why, the noble gases are placed in a separate group.
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
(b) What is the number of elements is 3rd period, the modern periodic table?
What are the periods in a periodic table? Give two characteristics of each.
What are the groups in a periodic table? Give two characteristics of each.
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
Define:
Periodic table
Name two elements in Alkaline earth metals.
Name two elements in Inert gas.
Name the type of elements which have outermost shell incomplete.
State its position in the periodic table?
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
What is the main characteristic of the last element in each period of the periodic table?
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
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?
An element E has following electronic configuration:
|
K |
L |
M |
|
2 |
8 |
6 |
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
The horizontal rows in a periodic table are called _____.
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
State the number of elements in Period 1 of the Periodic Table.
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
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: ______
The element which has the least tendency to lose electrons is ______
In the modern periodic table, elements are arranged according to their ______
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly in both situations.
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
Name the non-metals in the first twenty elements.
An element has 2 electrons in its N shell.
State its position in periodic table.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
