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प्रश्न
Which of the following statements about the Modern periodic table is correct?
विकल्प
18 horizontal rows are known as Periods.
7 vertical columns are known as Periods.
18 vertical columns are known as groups.
7 horizontal rows are known as groups.
उत्तर
18 vertical columns are known as groups.
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संबंधित प्रश्न
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?
State modern periodic law.
The modern periodic table was prepared by ______.
What is the number of valence electrons in the atoms of first elements in a period?
Explain why All the elements of a group have similar chemical properties.
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)
(d) (ii) and (iv)
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
Name two elements in each case: Lanthanides
Name the type of elements which have one electron short of octet.
Name the type of elements which have two electrons in the outermost orbit.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
Write a short note.
Structure of the modern periodic table.
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
State the modern periodic law.
How many periods and groups are there in 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?
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the symbol and valency of the following element and radical.
Ammonium
Give the symbol and valency of the following element and radical.
Bisulphate
Give the symbol and valency of the following element and radical.
Bisulphite
Give the symbol and valency of the following element and radical.
Sulphate
Give the chemical formula of sodium sulphite
Give the chemical formula of ammonium sulphate
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Mendeleev's periodic table : atomic mass : : Modern periodic table : _______
Group 13 to 18 : p block : : _______ : d block
Find the odd one out and give its explanation.
Complete the following flow chart.
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
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?
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
- 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 groups of modern periodic table.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
