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प्रश्न
Which of the following statement is always correct?
विकल्प
an atom has equal number of electrons and protons
an atom has equal number of electrons and neutrons
an atom has equal number of protons and neutrons
an atom has equal number of electrons, protons and neutrons
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उत्तर
An atom has equal number of protons and electrons
An atom always has equal number of protons and electrons in order to maintain electrical neutrality.
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संबंधित प्रश्न
Write true or false for the following statement
The central pad of the atom is called nucleus.
FILL IN THE BLANK
Gases become good conductors of electricity under ........ (low/high) pressure and .............. (low/high) voltage electrical discharge.
FILL IN THE BLANK
The electrons revolving in shells close to the nucleus are called ................... electrons.
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.
Name the negatively charged particle present in the atoms of all the elements.
State whether the following statement is true or false :
The anode rays obtained from all the gases consist of positively charged particles called protons.
Why is an atom neutral inspite of the presence of charged particles in it?
Define the term Valence shell.
State how electrons are distributed in an atom. Explain in brief the rules which govern their distribution.
