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प्रश्न
The K and L shells of the elements Na and Mg contain electrons.
विकल्प
Right
Wrong
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उत्तर
The K and L shells of the elements Na and Mg contain electrons- Right
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संबंधित प्रश्न
Write the merits of the modern periodic table over Mendeleev’s Periodic table
On which side of the periodic table will you find non-metals?
Explain why, the noble gases are placed in a separate group.
Name the scientist who prepared modern periodic table.
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
State how the valency of elements varies in a period of the periodic table?
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Name two elements in Alkali metals.
Name two elements in each case:
Transition element
What do you understand by typical elements?
State its position in the periodic table?
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 modern periodic law.
The horizontal rows in a periodic table are called _____.
Answer the following question.
Define the atomic size. Give its unit of measurement. In the modern periodic table what trend is observed in the atomic radius in a group and a period and why is it so?
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Sulphate
State what is meant by the term chemical formula.
Give the chemical formula of sodium bicarbonate
State the number of elements in Period 2 of the Periodic Table.
Compare Modern Periodic Law with Mendeleev's Periodic Law.
The groups 1 and 2 constitute the _______ block.
Distinguish between:
Group 17 - Group 18
What are groups and periods in the modern periodic table?
In the modern periodic table, elements are arranged according to their ______
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Which of the following elements would lose an electron easily?
Which of the following elements does not lose an electron easily?
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.
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 same valency as Lithium.
The maximum number of electrons that can be accommodated in s, p,d, and f subshells are ______.
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.
Select the appropriate options and complete the following paragraph:
(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).
On the basis of electronic configuration, elements in the modern periodic table are classified Into ______ blocks. Groups 1 and 2 elements are included in ______ and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in ______. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in ______ and all the elements are ______ elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute ______ and all these elements are metals.
