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Questions
State the modern periodic law.
Answer the following sub-question regarding the modern periodic table:
Write modern periodic law.
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Solution
Modern periodic law states that “The physical and chemical properties of all elements are a periodic function of their atomic numbers”.
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The modern periodic table consists of ……………. periods.
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Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
What is periodicity in properties of elements with reference to the Modern Periodic Table?
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The horizontal rows in a periodic table are called ...............
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Group 17 elements are known as ...............
How were the positions of cobalt and nickel resolved in the modern periodic table?
What is the name of those elements which divide metals and non-metals in the periodic table?
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
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How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
Explain why All the elements of a period have different chemical properties.
What are the merits of the modern periodic table of elements?
What are the periods in a periodic table? Give two characteristics of each.
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
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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?
How many groups and periods does the modern periodic table have?
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in each case:
Transition element
Answer the following in respect of element `31/15 P`
Give its electronic configuration
Write a short note.
Structure of the modern periodic table.
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
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.
Potassium
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
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
Find the correlation:
Group 1 and 2 : s block : : group 13 and 18 : ______
Right or wrong sentence.
The modern periodic table has 1 to 7 periods.
Write an explanation.
Period
Distinguish between:
s-block - p-block
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element? Explain?
Elements in the modern periodic table are arranged in ______groups and______ periods.
The scientist who propounded the modern periodic law is ______.
______ and ______ are called inner transition elements.
The amount of energy released when one or more electrons is added to the neutral atom is ______
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
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.
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
Compare the radii of two species X and Y. Give reasons for your answer.
- X has 12 protons and 12 electrons
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An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.
- Identify the element X
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- What would be the nature (acidic/ basic) of oxides formed?
- Locate the position of the element in the Modern Periodic Table.
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Which of the element is a Noble gas?
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.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
Answer the following in respect of element \[\ce{_16^32S}\].
To which group and period does it belong?
