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प्रश्न
Distinguish between:
Group 17 - Group 18
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उत्तर
| Group 17 | Group 18 | |
| 1. | Elements of group 17 are called halogens. | Elements of group 18 are called inert gas elements or noble gases. |
| 2. | They have seven valence electrons. | They have eight valence electrons except helium which contains 2 electrons. |
| 3. | Their valency is 1. | Their valency is zero. |
| 4. | They form diatomic molecules with general formula (X2). | They are monoatomic gases under normal conditions. |
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संबंधित प्रश्न
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
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 rows and columns are there in the Modem Periodic Table?
Why do all the elements of the same group have similar properties?
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
Write the merits of the modern periodic table over Mendeleev’s Periodic table
State modern periodic law.
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
What is meant by a period, in a 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?
What is the number of valence electrons in the atoms of first elements in a period?
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
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?
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
Name two elements in Inert gas.
Name the type of elements which have outermost shell complete.
Name the type of elements which have two electrons in the outermost orbit.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
From the standpoint of atomic structure, what determines which elements will be the first and which the last in a period of the periodic table?
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?
What are the elements.
Group 13 to 18 : p block : : _______ : d block
The modern periodic table has 1 to 7 periods.
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.
What are groups and periods in the modern periodic table?
How does the property vary in periods and in groups?
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 ______
The amount of energy released when one or more electrons is added to the neutral atom is ______
What is the symbol of the element Tungsten?
Which of the following is the outermost shell for elements of period 2?
Which of the following elements will form an acidic oxide?
Noble gases are placed in the ______ group in the modern periodic table.
State the group and period, of the element having three shells with three electrons in valence shell.
An element has 2 electrons in its N shell.
State its position in periodic table.
Match the atomic number with the following:
An element of group 2.
