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प्रश्न
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
विकल्प
Cu, Fe, Zn, Al
Al, Cu, Fe, Zn
Zn, Al, Cu, Fe
Fe, Zn, Al, Cu.
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उत्तर
Cu, Fe, Zn, Al
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संबंधित प्रश्न
What is periodicity in properties of elements with reference to the Modern Periodic Table?
Give two example of group 17 elements.
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
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.
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:
(a) electron
(b) proton
(c) neutron
(d) meson
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
What is the usual number of valence electrons in the atoms of the last element in a period?
Explain why All the elements of a group have similar chemical properties.
Explain why All the elements of a period have different chemical properties.
What is a period in a periodic table?
On the basis of electronic configuration, how will you identify chemically similar elements?
In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.
(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
Give the group number of following elements present in periodic table
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in halogens.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
State the modern periodic law.
An element A has 2 electrons in its fourth shell. State its electronic configuration.
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Sulphate
Give the chemical formula of sodium nitrate
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
Explain structure of modern periodic table in short.
State any five features of modern periodic table.
______ and ______ are called inner transition elements.
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Which of the following is the outermost shell for elements of period 2?
Which of the following elements will form an acidic oxide?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
Noble gases are placed in the ______ group in the modern periodic table.
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
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?
An element with atomic number ______ will form a basic oxide.
