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प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
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उत्तर
The modern periodic table consists of 7 periods.
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संबंधित प्रश्न
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?
How does the metallic character of elements in Modern Periodic Table vary on moving from left to right in a period, and (ii) down a group?Give reason to justify your answer.
Why do all the elements of the same group have similar properties?
Give two example of group 17 elements.
On which side of the periodic table will you find metals?
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
What is the number of elements is 1st period the modern periodic table?
Correct the statement.
Copper and zinc are representative elements.
Name two elements in halogens.
Name two elements in Inert gas.
What is the main characteristic of the last element in each period of the periodic table?
Name an alkali metal in period 3 and halogen in period 2.
What is the number of elements in the 1st period?
Give the symbol and valency of the following element and radical.
Sulphite
State what is meant by the term chemical formula.
Give the chemical formula of carbonic acid
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
State the number of elements in Period 1 of the Periodic Table.
Compare Modern Periodic Law with Mendeleev's Periodic Law.
What are the periods in a periodic table?
Group 1 and 2 : s block : : group 13 and 18 : _______
Find the odd one out and give its explanation.
Distinguish between:
s-block - p-block
How does the property vary in periods and in groups?
Which of the following is the outermost shell for elements of period 2?
Which one of the following elements exhibit maximum number of valence electrons?
Which of the following elements will form an acidic oxide?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
______ group elements are called alkaline earth metals.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
Answer the following in respect of element \[\ce{_16^32S}\].
To which group and period does it belong?
Match the atomic number with the following:
An element of group 2.
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?
