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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
The most abundant elements in the universe are
विकल्प
neon and argon
hydrogen and helium
aluminium and copper
oxygen and nitrogen
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उत्तर
hydrogen and helium
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संबंधित प्रश्न
Name: a Liquid Non-metal
Give two examples of Metalloids.
Mention three gaseous elements and write their molecular formulae
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – a gas with a pungent, choking odour which is lighter than air
Complete the statement – an element is a pure substance made up of ____________ atoms.
Write the names of elements from the following symbol:
Fe
Explain the difference between Metals and non-metals.
Represent with the help of a simple chart how matter is classified into pure or impure substances & further into elements, compounds & mixtures, with elements further segmented.
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
Match the following:
| 1. | Co2 | a. | Robert Boyle |
| 2. | Sulfur | b. | Making mobile phones |
| 3. | Element | c. | triatomic molecule |
| 4. | Gallium | d. | Polyatomic molecule |
