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प्रश्न
Elements in the modern periodic table are arranged in ______groups and______ periods.
पर्याय
7, 18
18, 7
17, 8
8, 17
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उत्तर
Elements in the modern periodic table are arranged in 18 groups and 7 periods.
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संबंधित प्रश्न
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?
What is meant by a group, in a periodic table?
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
How will the tendency to gain electrons change as we go from left to right across a period? Why?
An element A has 2 electrons in its fourth shell. State its electronic configuration.
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
Find the odd one out and give its explanation.
Right or wrong sentence.
The K and L shells of the elements Na and Mg contain electrons.
Distinguish between:
Group 17 - Group 18
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
