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प्रश्न
Select the correct answer from the choice in the bracket to complete the sentence:
An element ‘X’ has six electrons in its outer or valence shell. Its valency is __________.
विकल्प
+2
−2
−1
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उत्तर
An element ‘X has six electrons in its outer or valence shell. Its valency is −2.
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संबंधित प्रश्न
Name three fundamental particles of the atom. Give the symbol with charge, on each particle.
What are the two main parts of which an atom is made of?
FILL IN THE BLANK
In an atom, the last shell containing electrons is called its..................shell.
Tick the most appropriate answer.
Which of the following scientists observed that cathode rays consists of negatively charged particles?
- John Dalton
- J J Thomson
- James Chadwick
- Democritus
Tick the most appropriate answer.
In 1908, R A Millikan found the charge of an electron to be
- 1.6 x 10-19 C
- 1.6 x 10-15 C
- 1.4 x 10-19 C
- 1.6 x 19-16 C.
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
Fill in the blank of the following statement :
The electron has _________ charge, the proton has _________ charge, and the neutron has _________ charge.
Why is an atom neutral inspite of the presence of charged particles in it?
The particle not present in an ordinary hydrogen atom is :
Explain in brief – Goldstein’s experiment which led to the discovery of the proton.
