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प्रश्न
The modern periodic table is divided into which blocks?
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उत्तर
The modern periodic table is divided into s-block, p-block, d-block, f-block.
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संबंधित प्रश्न
Fill in the following blank with suitable word:
Group 1 elements are called ...............
The modern periodic table was prepared by ______.
Which element has two shells, both of which are completely filled with electrons?
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
Explain why All the elements of a group have similar chemical properties.
What is a group in the periodic table?
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 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.
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?
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
Name two elements in Inert gas.
What do you understand by typical elements?
Name the metals in the first twenty elements.
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
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?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Name an alkali metal in period 3 and halogen in period 2.
An element A has 2 electrons in its fourth shell. State its electronic configuration.
Define the atomic size.
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Ammonium
Give the chemical formula of sodium sulphite
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Mendeleev's periodic table : atomic mass : : Modern periodic table : _______
Group 13 to 18 : p block : : _______ : d block
Distinguish between:
Group 17 - Group 18
What is the symbol of the element Tungsten?
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 does not lose an electron easily?
Which of the following elements will form an acidic oxide?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
E and B
Define groups of modern periodic table.
State the group and period, of the element having three shells with three electrons in valence shell.
What is the general name of the last elements of the Periodic Table?
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
