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प्रश्न
How many rows and columns are there in the modern periodic table?
Write the number of periods and groups in the modern periodic table.
Answer the following sub-question regarding the modern periodic table:
Write the number of periods and groups.
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उत्तर
In the modern periodic table, there are 18 vertical columns known as groups and 7 horizontal rows known as periods.
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संबंधित प्रश्न
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
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?
What is periodicity in properties of elements with reference to the Modern Periodic Table?
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
Fill in the following blank with suitable word:
Group 1 elements are called ...............
Give two example of group 1 elements.
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
What is the number of valence electrons in the atoms of first elements in a period?
Explain why All the elements of a period have different chemical properties.
What are the merits of the modern periodic table of elements?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
What are the groups in a periodic table? Give two characteristics of each.
The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
(i) A and D
(ii) C and D
(iii) A and B
(iv) B and C
(v) A and C
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Name the scientist who stated the modern periodic law.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
Name the noble gas with 3 shells.
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
What is the number of elements in the 1st period?
What is the number of elements in the 3rd period, of 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?
Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Hydroxide
Give the chemical formula of sodium sulphite
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Compare Modern Periodic Law with Mendeleev's Periodic Law.
Answer the following question in one sentence.
The modern periodic table is divided into which blocks?
Right or wrong sentence.
The modern periodic table has 1 to 7 periods.
Write an explanation.
Period
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
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.
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.
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
State the group and period, of the element having three shells with three electrons in valence shell.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
An element has 2 electrons in its N shell.
State its position in periodic table.
