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प्रश्न
Match the atomic number with the following:
A rare gas.
विकल्प
19
15
8
4
2
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उत्तर
2
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संबंधित प्रश्न
In the Modern Periodic Table, which are the metals among the first ten elements?
Fill in the following blank with suitable word:
Group 18 elements are called ...............
On the basis of electronic configuration, how will you identify chemically similar elements?
How many groups and periods does the modern periodic table have?
State the modern periodic law.
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
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
State the number of elements in Period 1 of the Periodic Table.
State the number of elements in Period 3 of the 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 same valency as Lithium.
