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प्रश्न
Complete the following flow chart.
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उत्तर
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संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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A
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B
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C
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(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
Why do all the elements of the same group have similar properties?
What is meant by a period, in a periodic table?
Give two example of group 18 elements.
On which side of the periodic table will you find non-metals?
Name the scientist who prepared modern periodic table.
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
State how the valency of elements varies in a group of the periodic table?
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
What are the merits of the modern periodic table of elements?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
What is meant in the periodic table by a period?
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Nitrate
State what is meant by the term chemical formula.
Give the chemical formula of ammonium sulphate
Answer the following question in one sentence.
The modern periodic table is divided into which blocks?
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
Write an explanation.
Period
Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
Write a scientific reason.
Lithium and sodium are included in the same group in the periodic table.
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?
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
______ and ______ are called inner transition elements.
The amount of energy released when one or more electrons is added to the neutral atom is ______
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.
- Identify the element X
- Write the electronic configuration of X
- Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?
- What would be the nature (acidic/ basic) of oxides formed?
- Locate the position of the element in the Modern Periodic Table.
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
Define periods of modern periodic table.
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.
What is the general name of the last elements of the Periodic Table?
Give reason for the following:
Inert gases do not form ion.
