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प्रश्न
State the modern periodic law.
Answer the following sub-question regarding the modern periodic table:
Write modern periodic law.
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उत्तर
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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संबंधित प्रश्न
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 17 elements are known as ...............
Give two example of group 1 elements.
How were the positions of cobalt and nickel resolved in the modern periodic table?
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
Explain why All the elements of a group have similar chemical properties.
State how the valency of elements varies in a period of the periodic table?
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in Alkaline earth metals.
Name two elements in Inert gas.
Name the type of elements which have outermost shell incomplete.
What is the main characteristic of the last element in each period of the periodic table?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Name an alkali metal in period 3 and halogen in period 2.
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
What is meant in the periodic table by a period?
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
Two elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, respectively. Compare the following characteristics in the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
- Their metallic characters
- Formation of their oxides
- Formulae of their chlorides
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Calcium
Give the symbol and valency of the following element and radical.
Zinc
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the chemical formula of carbonic acid
What are the elements.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Find the odd one out and give its explanation.
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.
What are groups and periods in the modern periodic table?
______ is the longest period in the periodical table.
How does the property vary in periods and in groups?
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
The longest period of the Modern Periodic Table is period.
Which of the following statements about the Modern Periodic Table is correct:
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?
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
- Write the electronic configuration of X
- Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?
- What would be the nature (acidic/ basic) of oxides formed?
- Locate the position of the element in the Modern Periodic Table.
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.
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 same valency as Lithium.
Noble gases are placed in the ______ group in the modern periodic table.
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 |
Write the molecular formula of the compound formed by the combination:
A and F
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 |
Write the molecular formula of the compound formed by the combination:
E and B
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
Give reason for the following:
Inert gases do not form ion.
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?
