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प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
उत्तर
The modern periodic table consists of 7 periods.
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संबंधित प्रश्न
In the Modern Periodic Table, which are the metals among the first ten elements?
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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A
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B
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C
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(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
What is meant by a period, in a periodic table?
How were the positions of isotopes of an element decided in the modern periodic table?
Name the scientist who prepared modern periodic table.
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
State how the valency of elements varies in a group of the periodic table?
State how the valency of elements varies in a period of the periodic table?
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.
How many groups and periods does the modern periodic table have?
Name two elements in Alkali metals.
Name two elements in Alkaline earth metals.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
Answer the following in respect of element `31/15 P`
Give its electronic configuration
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
State what is meant by the term chemical formula.
Find the odd one out and give its explanation.
Find the odd one out and give its explanation.
The K and L shells of the elements Na and Mg contain electrons.
Distinguish between:
s-block - p-block
Distinguish between:
Group 17 - Group 18
The scientist who propounded the modern periodic law is ______.
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?
Compare the radii of two species X and Y. Give reasons for your answer.
- X has 12 protons and 12 electrons
- Y has 12 protons and 10 electrons
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
Name the non-metals in the first twenty elements.
An element has 2 electrons in its N shell.
State its position in periodic table.
