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प्रश्न
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
उत्तर
(c) It has 18 vertical columns known as groups.
In the modern periodic table, there are 18 vertical columns known as groups.
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संबंधित प्रश्न
Explain why All the elements of a group have similar chemical properties.
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
What are the merits of the modern periodic table of elements?
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?
What is meant in the periodic table by a period?
What are the elements.
To the left of the zig-zag line in the periodic table are the metal elements.
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
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
Match the atomic number with the following:
An element of group 2.
