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प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
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उत्तर
The modern periodic table consists of 7 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?
What is periodicity in properties of elements with reference to the Modern Periodic Table?
Fill in the following blank with suitable word:
Group 1 elements are called ...............
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
How were the positions of isotopes of an element decided in the modern periodic table?
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
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.
What is a period in a periodic table?
On the basis of electronic configuration, how will you identify chemically similar elements?
What is the number of elements is 1st period the modern periodic table?
What is a group in the periodic table?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period 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.
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?
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
How many groups and periods does the modern periodic table have?
Name two elements in Alkali metals.
Name two elements in halogens.
Name two elements in each case:
Transition element
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
State what is meant by the term chemical formula.
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
The groups 1 and 2 constitute the ______ block.
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Find the odd one out and give its explanation.
State any five features of modern periodic table.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
Which of the following elements would lose an electron easily?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
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
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
The maximum number of electrons that can be accommodated in s, p,d, and f subshells are ______.
Define groups of modern periodic table.
