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प्रश्न
Complete the following flow chart.
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उत्तर
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
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.
Why do all the elements of the same group have similar properties?
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.
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
On which side of the periodic table will you find metals?
Name the scientist who prepared modern periodic table.
Give alongside is a part of the periodic table :
As we move horizontally from left to right:
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
Explain why All the elements of a period have different chemical properties.
State how the valency of elements varies in a group of the periodic table?
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
Define:
Periodic table
Name two elements in halogens.
Name two elements in Inert gas.
Name two elements in each case:
Transition element
Name the type of elements which have two outermost shell incomplete.
How does the electronic configuration of an atom relate to its position in the modern periodic table?
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
Name an element of group 18 which can form compounds.
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Bicarbonate
Give the chemical formula of ammonium sulphate
Give the chemical formula of carbonic acid
What are the periods in a periodic table?
The d-block elements are called as ______ elements.
p-block is composed of groups 1 and 2.
Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
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?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
Noble gases are placed in the ______ group 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.
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 metalloids in the first twenty elements.
Match the atomic number with the following:
An element of group 2.
