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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?
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
What is meant by a period, in a 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?
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.
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?
What is the number of valence electrons in the atoms of first elements in a period?
What is a period in a periodic table?
What are the advantages of the periodic table?
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
Give the group number of following elements present in periodic table
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Name the scientist who stated the modern periodic law.
Correct the statement.
Copper and zinc are representative elements.
Name two elements in Alkali metals.
Name the type of elements which have outermost shell incomplete.
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
Name an alkali metal in period 3 and halogen in period 2.
State the main aim of classifying elements. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table? Name and state the law based on this fundamental property. On which side of the periodic table one can find metals, non-metals and metalloids?
Give the chemical formula of magnesium nitrate
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
What are the periods in a periodic table?
The groups 1 and 2 constitute the ______ block.
Find the odd one out and give its explanation.
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.
How does the property vary in periods and in groups?
Element ‘X’ forms a chloride with the formula XCl2, which is solid with a high melting point. X would most likely be in the same group of the periodic table as: ______
Which of the following elements does not lose an electron easily?
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 |
Which of the element is a Metalloid?
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.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
Name the metalloids 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.
