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प्रश्न
Write an Explanation.
Period
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उत्तर
A period is a horizontal row in the periodic table where elements have the same number of electron shells and show a gradual change in properties across the row.
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
What is meant by a group, in a periodic table?
How were the positions of cobalt and nickel resolved in the modern periodic table?
Explain why, the noble gases are placed in a separate group.
The modern periodic table was prepared by ______.
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
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
Name two elements in each case: Lanthanides
Name two elements in each case:
Actinides
Name the metals in the first twenty elements.
Name the type of elements which have two outermost shell incomplete.
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?
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
Define the atomic size.
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Sulphite
State the number of elements in Period 1 of the Periodic Table.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Group 13 to 18 : p block : : _______ : d block
Find the odd one out and give its explanation.
The modern periodic table has 1 to 7 periods.
What are groups and periods in the modern periodic table?
The element which has the least tendency to lose electrons is ______
On moving from left to right in a period in the periodic table, the size of the atom ______
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?
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.
______ group elements are called alkaline earth metals.
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.
An element with atomic number ______ will form a basic oxide.
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.
Name the non-metals in the first twenty elements.
