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प्रश्न
The modern periodic table shows the molecular masses of the elements in each frame.
विकल्प
Right
Wrong
उत्तर
The modern periodic table shows the molecular masses of the elements in each frame- Wrong
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संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
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?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
What is meant by a group, in a periodic table?
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:
(a) electron
(b) proton
(c) neutron
(d) meson
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same period of the periodic table?
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.
On the basis of electronic configuration, how will you identify chemically similar elements?
What are the merits of the modern periodic table of elements?
In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
Consider the following elements:
20Ca, 8O, 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be:
(i) very stable?
(ii) in group 2 of the periodic table?
(iii) in group 16 of the periodic table?
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
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
The horizontal rows in a periodic table are called _____.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the chemical formula of calcium phosphate
Group 13 to 18 : p block : : _______ : d block
To the left of the zig-zag line in the periodic table are the metal elements.
Write an Explanation.
Period
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
Noble gases belong to______ group of the periodic table.
The scientist who propounded the modern periodic law is ______.
What is the symbol of the element Tungsten?
Which of the following statements about the Modern Periodic Table is correct:
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
______ group elements are called alkaline earth metals.
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
1H2 is an isotope of hydrogen. In the modern Periodic Table it will ______.
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.
An element has 2 electrons in its N shell.
State its position in periodic table.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
