Advertisements
Advertisements
प्रश्न
Write an explanation.
Period
Advertisements
उत्तर
A period is a horizontal row in the periodic table where elements have the same number of electron shells and show a gradual change in properties across the row.
APPEARS IN
संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
How many rows and columns are there in the modern periodic table?
What is periodicity in properties of elements with reference to the Modern Periodic Table?
What is meant by a group, in a periodic table?
How were the positions of isotopes of an element decided in the modern periodic table?
On which side of the periodic table will you find metals?
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
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.
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 two shells, both of which are completely filled with electrons?
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.
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
State how the valency of elements varies in a period of 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 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.
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
Correct the statement.
Copper and zinc are representative elements.
Name two elements in Alkali metals.
What is the main characteristic of the last element in each period of the periodic table?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
What is the number of elements in the 3rd period, of the modern periodic table?
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
Give the symbol and valency of the following element and radical.
Hydrogen
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Ammonium
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.
State the number of elements in Period 3 of the Periodic Table.
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is an element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
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.
______ group elements are called alkaline earth metals.
Spot the error:
The elements of group 13 are called the carbon family.
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
Name the metalloids in the first twenty elements.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
