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प्रश्न
Right or wrong sentence.
The modern periodic table has 1 to 7 periods.
विकल्प
Right
Wrong
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उत्तर
The given sentence is wrong.
Explanation:
The modern periodic table has seven periods. The horizontal rows are called periods; the lanthanide and actinide rows are often shown separately but belong to periods 6 and 7.
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संबंधित प्रश्न
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
How many periods and groups are there in the long form of periodic table?
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
How were the positions of isotopes of an element decided in the modern periodic table?
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
Which element has two shells, both of which are completely filled with electrons?
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.
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?
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 the first element of a period?
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.
What are the groups in a periodic table? Give two characteristics of each.
Name two elements in Alkaline earth metals.
Name two elements in Inert gas.
What do you understand by typical elements?
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
Name the noble gas with 3 shells.
State the modern periodic law for the classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
State the modern periodic law.
Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
Define the atomic size.
Give the chemical formula of calcium phosphate
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
What are the periods in a periodic table?
Find the correlation:
Mendeleev’s periodic table : atomic mass : : Modern periodic table : _______
Find the correlation:
Group 1 and 2 : s block : : group 13 and 18 : ______
Answer the following question in one sentence.
The modern periodic table is divided into which blocks?
State any five features of modern 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?
Which of the following statements about the Modern Periodic Table is correct:
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
Spot the error:
The elements of group 13 are called the carbon family.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
An element has 2 electrons in its N shell.
State its position in periodic table.
Match the atomic number with the following:
A rare gas.
