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The lightest element in the periodic tab...

The lightest element in the periodic table is

A

Helium

B

Sodium

C

Hydrogen

D

Potassium

Text Solution

Verified by Experts

The correct Answer is:
C
Hydrogen element is the lightest element among all the elements known so far. Most of the mass of stars and the Sun is made up of hydrogen. One of its atoms has a proton, an electron. It is found in gaseous state at normal temperature. It is the lightest element (density 0.09 grams per liter). It has atomic number 1 and atomic weight of 1.008.It occupies the first position in the periodic table .
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AGRAWAL EXAM CART BIHAR-METALS AND NON-METALS-IMPORTANT QUESTIONS
  1. The lightest element in the periodic table is

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  2. Choose the incorrect information about metals:

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  3. Which of the following metals is not solid at room temperature ?

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  4. Which of the following has highest tensile strength ?

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  5. Most malleable metal is:

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  6. Metals are usually hard. But exception to this fact is:

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  7. The metal with exceptionally low melting point is:

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  8. The most reactive element among the following is:

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  9. Which of the following metals is suggested to be stored submerged in k...

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  10. Which metal is suitable to store acid in its vessel?

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  11. Potassium metal should be stored in:

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  12. Magnesium reacts with oxygen to give:

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  13. Which of the following reacts vigorously with water?

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  14. Which of the following metals does not react with water at all?

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  15. What would be the product of following reaction? underset("(Gold)")...

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  16. In a reaction, copper can displace:

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  17. Which of the following burns with an explosion in contact with water a...

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  18. Complete the following equation: Zn + CuSO4 to ………. + Cu

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  19. A non-metal having lusture is:

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  20. The good conductor of electricity is:

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  21. Which of the following elements isametalloid?

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