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प्रश्न
Match the atomic number with the following:
A rare gas.
पर्याय
19
15
8
4
2
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उत्तर
2
संबंधित प्रश्न
What is the usual number of valence electrons in the atoms of the last element in a period?
The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
(i) A and D
(ii) C and D
(iii) A and B
(iv) B and C
(v) A and C
Name two elements in Alkaline earth metals.
Name two elements in each case:
Actinides
Name the metals in the first twenty elements.
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
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
State what is meant by the term chemical formula.
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?
Name the metalloids in the first twenty elements.
