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प्रश्न
State which element exists in the highest percentage in earth’s crust.
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उत्तर
Oxygen (O) – 46.1%
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संबंधित प्रश्न
Name the element used as a standard for atomic mass scale.
Match the noble gases – with their correct symbols:
| Noble gases | Symbols |
| (a) Helium | (1) Ar |
| (b) Neon | (2) Xe |
| (c) Argon | (3) Rn |
| (d) Krypton | (4) He |
| (e) Xenon | (5) Kr |
| (f) Radon | (6) Ne |
Select the correct answer from the choice given below.
The type of element-phosphorus
Give the symbol of the following element:
Silicon
State the type of element for the following:
Copper
State what is meant by the term ‘activity series of metals’.
Give the formula of the following gas:
Ammonia
State the valency of the following metallic element and write symbol with the valency
Potassium
State the valency of the following metallic element and write symbol with the valency
Zinc
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).
Nitrate
