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प्रश्न
Define groups of modern periodic table.
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उत्तर
In the modern periodic table, groups (also known as families) are the 18 vertical columns that organize chemical elements by shared properties. Unlike periods, which are horizontal rows representing electron shells, groups are vertical columns of elements with similar chemical properties.
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संबंधित प्रश्न
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
Fill in the following blank with suitable word:
Group 18 elements are called ...............
Give two example of group 1 elements.
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
Explain why, the noble gases are placed in a separate group.
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same period of the periodic table?
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
State how the valency of elements varies in a period of the periodic table?
What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
(i) A and D
(ii) C and D
(iii) A and B
(iv) B and C
(v) A and C
Give the group number of following elements present in periodic table
Name two elements in each case:
Actinides
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?
How will the tendency to gain electrons change as we go from left to right across a period? Why?
Write a short note.
Structure of the modern periodic table.
How many periods and groups are there in the modern periodic table?
What is the number of elements in the 1st period?
Name an element of group 18 which can form compounds.
The horizontal rows in a periodic table are called _____.
Two elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, respectively. Compare the following characteristics in the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
- Their metallic characters
- Formation of their oxides
- Formulae of their chlorides
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Bisulphite
Give the symbol and valency of the following element and radical.
Carbonate
Give the symbol and valency of the following element and radical.
Sulphite
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
What are the periods in a periodic table?
To the left of the zig-zag line in the periodic table are the metal elements.
______ is the longest period in the periodical table.
On moving from left to right in a period in the periodic table, the size of the atom ______
An element which is an essential constituent of all organic compounds belongs to
Which of the following elements would lose an electron easily?
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
