Advertisements
Advertisements
प्रश्न
Explain structure of modern periodic table in short.
Advertisements
उत्तर
- The modern periodic table consists of seven horizontal rows called the periods and eighteen vertical columns called the groups.
- The arrangement of the periods and groups forms boxes, with each box corresponding to the position of an element.
- Atomic numbers are serially indicated in the upper part of these boxes.
- In addition to these seven rows, the lanthanide and actinide series are shown separately at the bottom of the periodic table. The first row is the lanthanide series, and the second row is the actinide series.
- There are 118 boxes in the periodic table, including the two series. vi. The entire periodic table is divided into four blocks: s-block, p-block, d-block and f-block.
-
- s-block: contains group 1 and 2 elements
- p-block: contains groups 13 to 18 elements
- d-block: contains groups 3 to 12 elements (transition elements)
- f-block: contains the lanthanide and actinide series
- A zig-zag line is drawn in the p-block of the periodic table. Metals lie on the left side while nonmetals lie on the right side of this line. Metalloids lie along the border of this line.
APPEARS IN
संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
In the Modern Periodic Table, which are the metals among the first ten elements?
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.
What is periodicity in properties of elements with reference to the Modern Periodic Table?
How were the positions of isotopes of an element decided in the modern periodic table?
What is the number of valence electrons in the atoms of first elements in a period?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
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.
Name the metals in the first twenty elements.
Name the type of elements which have outermost shell complete.
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
Name the noble gas with 3 shells.
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
The horizontal rows in a periodic table are called _____.
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?
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of sodium nitrate
Give the chemical formula of magnesium nitrate
Compare Modern Periodic Law with Mendeleev's Periodic Law.
The groups 1 and 2 constitute the ______ block.
Which of the following statements about the Modern periodic table is correct?
Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
Write a scientific reason.
Lithium and sodium are included in the same group in the periodic table.
Noble gases belong to______ group of the periodic table.
______ forms the basis of the modern periodic table.
The scientist who propounded the modern periodic law is ______.
The element which has the least tendency to lose electrons is ______
On moving from left to right in a period in the periodic table, the size of the atom ______
Which of the following elements would lose an electron easily?
Which of the following elements will form an acidic oxide?
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has a similar structure to diamond.
______ group elements are called alkaline earth metals.
Spot the error:
The elements of group 13 are called the carbon family.
Select the appropriate options and complete the following paragraph:
(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).
On the basis of electronic configuration, elements in the modern periodic table are classified Into ______ blocks. Groups 1 and 2 elements are included in ______ and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in ______. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in ______ and all the elements are ______ elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute ______ and all these elements are metals.
Match the atomic number with the following:
An element of group 2.
Give reason for the following:
Inert gases do not form ion.
