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प्रश्न
Select the correct answer from the choice given below.
The negatively charged particles in an atom
पर्याय
protons
neutrons
electrons
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उत्तर
electrons
संबंधित प्रश्न
Correct the following statement:
CO and Co both represents cobalt.
Give Two Examples for Each of the Following: Inert Gases
Differentiate between:
Homogenous and heterogenous substances
State the number of atoms of CaCO3
Match the Columns:
| Column A | Column B | ||
| (a) | Metals | (i) | Non-Reactive |
| (b) | Molecules | (ii) | Brittle |
| (c) | Non-Metals | (iii) | Lustrous |
| (d) | Noble Gases | (iv) | Smallest unit of Compound |
Complete the statement with the correct words.
__________ are chemicals formed on reaction of a base with an _____ giving salt and water.
Complete the statement given below by filling in the blank with the correct word.
An element is a pure substance which cannot be broken down by physical or _________ methods.
There are ______ number of known elements.
Assertion: Air is a mixture of elements only.
Reason: Only nitrogen, oxygen and neon gases exist in air.
Match the following:
| 1. | Co2 | a. | Robert Boyle |
| 2. | Sulfur | b. | Making mobile phones |
| 3. | Element | c. | triatomic molecule |
| 4. | Gallium | d. | Polyatomic molecule |
