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प्रश्न
The K and L shells of the elements Na and Mg contain electrons.
पर्याय
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
In the Modern Periodic Table, which are the metals among the first ten elements?
What is periodicity in properties of elements with reference to the Modern 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.
Give two example of group 1 elements.
Give two example of group 18 elements.
On which side of the periodic table will you find non-metals?
Would you place the two isotopes of chlorine, CI-35 and CI-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
Name the scientist who prepared modern periodic table.
The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
(a) P
(b) Q
(c) R
(d) S
Which element has two shells, both of which are completely filled with electrons?
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
State how the valency of elements varies in a period of the periodic table?
What is a period in a periodic table?
On the basis of electronic configuration, how will you identify the first element of a period?
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?
Name the scientist who stated the modern periodic law.
Name two elements in Alkali metals.
Name two elements in Alkaline earth metals.
Name the type of elements which have outermost shell incomplete.
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the chemical formula of magnesium nitrate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
What are the periods in a periodic table?
The groups 1 and 2 constitute the _______ block.
Which of the following statements about the Modern periodic table is correct?
Write an Explanation.
Period
Explain structure of modern periodic table in short.
State any five features of modern periodic table.
______ and ______ are called inner transition elements.
The longest period of the Modern Periodic Table is period.
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly in both situations.
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?
Match the atomic number with the following:
A rare gas.
