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प्रश्न
Explain structure of modern periodic table in short.
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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.
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- 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.
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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 –
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Group 16
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Group 17
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A
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B
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C
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(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?
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
Give two example of group 1 elements.
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
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
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?
What is the number of elements is 1st period the modern periodic table?
What are the merits of the modern periodic table of elements?
The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here not the chemical symbols of the elements):
| a 3 |
b 4 |
c 5 |
d 6 |
e 7 |
f 8 |
g 9 |
h 10 |
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| i 11 |
j 12 |
k 13 |
l 14 |
m 15 |
n 16 |
o 17 |
p 18 |
(i) Which element has a bigger atom, a or f?
(ii) Which element has a higher valency, k or o?
(iii) Which element is more metallic i or k?
(iv) Which element is more non-metallic, d or g?
(v) Select a latter which represents a metal of valency 2.
(vi) Select a letter which represents a non-metal of valency 2.
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.
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Name two elements in each case: Lanthanides
Name the type of elements which have two outermost shell incomplete.
Name the type of elements which have two electrons in the outermost orbit.
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
Name the noble gas with 3 shells.
State the main aim of classifying elements. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table? Name and state the law based on this fundamental property. On which side of the periodic table one can find metals, non-metals and metalloids?
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
How many periods and groups are there in the modern periodic table?
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the chemical formula of sodium hydroxide
Give the chemical formula of sodium bicarbonate
Give the chemical formula of magnesium nitrate
State any five features of modern periodic table.
______ forms the basis of the modern periodic table.
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Which one of the following elements exhibit maximum number of valence electrons?
Which of the following elements does not lose an electron easily?
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
The maximum number of electrons that can be accommodated in s, p,d, and f subshells are ______.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.
An element with atomic number ______ will form a basic oxide.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
Match the atomic number with the following:
A rare gas.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
