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प्रश्न
Define periods of modern periodic table.
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उत्तर
The horizontal rows are called periods. The table consists of 7 periods, numbered from 1 to 7 from top to bottom.
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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?
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
What is meant by a group, in a periodic table?
On which side of the periodic table will you find metals?
Explain why, the noble gases are placed in a separate group.
Would you place the two isotopes of chlorine, CI-35 and CI-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
What is the number of elements is 1st period the modern periodic table?
(b) What is the number of elements is 3rd period, the modern 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?
What are horizontal rows and vertical columns in a periodic table known as?
Correct the statement.
Copper and zinc are representative elements.
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
Name the type of elements which have outermost shell complete.
Name an alkali metal in period 3 and halogen in period 2.
How will the tendency to gain electrons change as we go from left to right across a period? Why?
What is meant in the periodic table by a period?
Give the symbol and valency of the following element and radical.
Zinc
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Nitrate
Compare Modern Periodic Law with Mendeleev's Periodic Law.
The groups 1 and 2 constitute the _______ block.
Find the odd one out and give its explanation.
Distinguish between:
Group 17 - Group 18
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.
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is A element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
Noble gases belong to______ group of the periodic table.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
The element which has the least tendency to lose electrons is ______
Which one of the following elements exhibit maximum number of valence electrons?
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has a similar structure to diamond.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
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.
State the group and period, of the element having three shells with three electrons in valence shell.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
What is the general name of the last elements of the Periodic Table?
