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प्रश्न
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
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संबंधित प्रश्न
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
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.
Explain why, the noble gases are placed in a separate group.
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
The modern periodic table was prepared by ______.
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 group of the periodic table?
Which element has two shells, both of which are completely filled with electrons?
How would the tendency to lose electrons change as we go from left to right across a 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.
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
What are the merits of the modern periodic table of elements?
(b) What is the number of elements is 3rd period, the modern periodic table?
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?
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
How many groups and periods does the modern periodic table have?
Name two elements in Alkali metals.
What do you understand by typical elements?
Name the type of elements which have two outermost shell incomplete.
Name the type of elements which have one electron short of octet.
How many periods and groups are there in the modern periodic table?
What is the number of elements in the 3rd period, of the modern periodic table?
Give the symbol and valency of the following element and radical.
Calcium
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
State the number of elements in Period 3 of the Periodic Table.
Compare Modern Periodic Law with Mendeleev's Periodic Law.
Find the odd one out and give its explanation.
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
Distinguish between:
s-block - p-block
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element. Explain.
______ and ______ are called inner transition elements.
The inert gas which lies in the third period is ______
Which of the following elements will form an acidic oxide?
Define periods of modern periodic table.
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.
Name the metalloids in the first twenty elements.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
