Advertisements
Advertisements
प्रश्न
Right or wrong sentence.
The modern periodic table has 1 to 7 periods.
विकल्प
Right
Wrong
Advertisements
उत्तर
The given sentence is wrong.
Explanation:
The modern periodic table has seven periods. The horizontal rows are called periods; the lanthanide and actinide rows are often shown separately but belong to periods 6 and 7.
APPEARS IN
संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
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?
Fill in the following blank with suitable word:
Group 18 elements are called ...............
Give two example of group 17 elements.
On which side of the periodic table will you find metals?
Which element has the electronic configuration 2, 8, 2?
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
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?
What are the advantages of the periodic table?
Correct the statement.
Copper and zinc are representative elements.
Name two elements in Inert gas.
Name two elements in each case:
Transition element
Name the metals in the first twenty elements.
Name the type of elements which have outermost shell incomplete.
Name the type of elements which have two outermost shell incomplete.
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
Write a short note.
Structure of the modern periodic table.
Name an element of group 18 which can form compounds.
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.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Zinc
State the number of elements in Period 1 of the Periodic Table.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Find the odd one out and give its explanation.
Distinguish between:
Group 17 - Group 18
Explain structure of modern periodic table in short.
______ forms the basis of the modern periodic table.
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
- Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
- Determine its position in the modem periodic table.
- What is the nature of its oxide?
- Name one other element of its group.
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 ______.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
Name the metalloids in the first twenty elements.
