Advertisements
Advertisements
प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
उत्तर
The modern periodic table consists of 7 periods.
APPEARS IN
संबंधित प्रश्न
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
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.
Fill in the following blank with suitable word:
Group 18 elements are called ...............
How many periods and groups are there in the long form of periodic table?
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
How were the positions of cobalt and nickel resolved in the modern 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
Which element has two shells, both of which are completely filled with electrons?
Which element has the electronic configuration 2, 8, 2?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
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?
Name the scientist who stated the modern periodic law.
Correct the statement.
Copper and zinc are representative elements.
Name two elements in Alkaline earth metals.
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Name the noble gas with 3 shells.
An element E has following electronic configuration:
|
K |
L |
M |
|
2 |
8 |
6 |
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.
What is the number of elements in the 1st period?
Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
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 the number of elements in Period 3 of the Periodic Table.
Compare Modern Periodic Law with Mendeleev's Periodic Law.
To the left of the zig-zag line in the periodic table are the metal elements.
______ and ______ are called inner transition elements.
The longest period of the Modern Periodic Table is period.
Which of the following elements would lose an electron easily?
Noble gases are placed in the ______ group in the modern periodic table.
Group 16 elements are collectively called as ______.
______ group elements are called alkaline earth metals.
Define periods of modern periodic table.
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
1H2 is an isotope of hydrogen. In the modern Periodic Table it will ______.
Answer the following in respect of element \[\ce{_16^32S}\].
To which group and period does it belong?
