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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
In the Modern Periodic Table, which are the metals among the first ten elements?
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
How many rows and columns are there in the modern periodic table?
How does the metallic character of elements in Modern Periodic Table vary on moving from left to right in a period, and (ii) down a group?Give reason to justify your answer.
What is periodicity in properties of elements with reference to the Modern Periodic Table?
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.
What is meant by a period, in a 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
What is the usual number of valence electrons in the atoms of the last element in a period?
On the basis of electronic configuration, how will you identify the first element of a period?
What is the number of elements is 1st period the modern periodic table?
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here not the chemical symbols of the elements):
| a 3 |
b 4 |
c 5 |
d 6 |
e 7 |
f 8 |
g 9 |
h 10 |
|
| i 11 |
j 12 |
k 13 |
l 14 |
m 15 |
n 16 |
o 17 |
p 18 |
(i) Which element has a bigger atom, a or f?
(ii) Which element has a higher valency, k or o?
(iii) Which element is more metallic i or k?
(iv) Which element is more non-metallic, d or g?
(v) Select a latter which represents a metal of valency 2.
(vi) Select a letter which represents a non-metal of valency 2.
How many groups and periods does the modern periodic table have?
Name two elements in Alkali metals.
Name two elements in Inert gas.
Name two elements in each case:
Transition element
Name two elements in each case:
Actinides
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
Write a short note.
Structure of the modern periodic table.
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
State the modern periodic law.
What is meant in the periodic table by a period?
Two elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, respectively. Compare the following characteristics in the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
- Their metallic characters
- Formation of their oxides
- Formulae of their chlorides
Give the symbol and valency of the following element and radical.
Calcium
Give the symbol and valency of the following element and radical.
Ammonium
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
The groups 1 and 2 constitute the _______ block.
Group 13 to 18 : p block : : _______ : d block
On moving from left to right in a period in the periodic table, the size of the atom ______
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Which one of the following elements exhibit maximum number of valence electrons?
Which of the following elements will form an acidic oxide?
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has a similar structure to diamond.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
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.
Select the appropriate options and complete the following paragraph:
(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).
On the basis of electronic configuration, elements in the modern periodic table are classified Into ______ blocks. Groups 1 and 2 elements are included in ______ and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in ______. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in ______ and all the elements are ______ elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute ______ and all these elements are metals.
An element has 2 electrons in its N shell.
State its position in periodic table.
Give reason for the following:
Inert gases do not form ion.
