Advertisements
Advertisements
प्रश्न
The d-block elements are called as ______ elements.
पर्याय
transition
metalloid
normal
inner transition
Advertisements
उत्तर
The d-block elements are called as transition elements.
Explanation:
The d-block elements are known as transition elements because they are positioned between the highly reactive s-block metals and the less metallic p-block elements. Their properties represent a “transition” from the strongly electropositive nature of s-block metals to the covalent and non-metallic nature of p-block elements.
APPEARS IN
संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
The position of three elements A, B and C in the Periodic Table are shown below –
|
Group 16
|
Group 17
|
|
−
|
−
|
|
−
|
A
|
|
−
|
−
|
|
B
|
C
|
(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?
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?
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:
(a) electron
(b) proton
(c) neutron
(d) meson
Which element has the electronic configuration 2, 8, 2?
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
What is a period in a periodic table?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
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 are the advantages of the periodic table?
What are the periods in a periodic table? Give two characteristics of each.
Define:
Periodic table
Name two elements in each case:
Transition element
Name the type of elements which have outermost shell complete.
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in 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?
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Carbonate
Give the symbol and valency of the following element and radical.
Sulphate
Give the chemical formula of sodium bicarbonate
Give the chemical formula of calcium phosphate
The groups 1 and 2 constitute the ______ block.
Distinguish between:
s-block - p-block
Explain structure of modern periodic table in short.
Noble gases belong to______ group of the periodic table.
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
What are groups and periods in the modern periodic table?
On moving from left to right in a period in the periodic table, the size of the atom ______
What is the symbol of the element Tungsten?
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?
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
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 |
Which of the element is a Metalloid?
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
Define groups of modern periodic table.
