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प्रश्न
Give the names and symbols of the first twenty elements of the periodic table.
उत्तर
| Name | Symbol | Name | Symbol |
| Hydrogen | H | Sodium | Na |
| Helium | He | Magnesium | Mg |
| Lithium | Li | Aluminium | Al |
| Beryllium | Be | Silicon | Si |
| Boron | B | Phosphorus | P |
| Carbon | C | Sulphur | S |
| Nitrogen | N | Chlorine | Cl |
| Oxygen | O | Argon | Ar |
| Fluorine | F | Potassium | K |
| Neon | Ne | Calcium | Ca |
संबंधित प्रश्न
The formula of the sulphate of an element X is X2(SO4)3. The formula of nitride of element X will be :
The formula of the sulphate of an element M is M2(SO4)3
Write the formula of it
Oxide
Write the formula of the compound formed – given symbols and combining power or capacity (valency) of the following element in the compound.
Na1+ Cl1-
Match the formulas of the following gases with their correct names :
Gases - (a) H2 (b) N2 (c) O2 (d) Cl2 (e) HCI (f) NH3 (g) CO (h) CO2 (i) SO2 (j) NO (k) NO2.
Names:
(1) Ammonia (2) Nitrogen Dioxide (3) Oxygen (4) Hydrogen (5) Nitrogen (6) Chlorine (7) Carbon Monoxide (8) Sulphur Dioxide (9) Nitrogen Monoxide (10) Carbon Dioxide (11) Hydrogen Chloride
Give the symbol of the following element:
Zinc
State the type of element for the following:
Iodine
Give three reasons why – carbon dioxide is considered a compound, while carbon – an element.
Write the radical of the following valency:
Sulphur [Sulphide]
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Permanganate
Write a note on Greem symbols.
