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प्रश्न
Give the following a suitable word/phrase.
The electrons present in the outermost shell.
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उत्तर
This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.
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संबंधित प्रश्न
Give the following a suitable word/phrase.
The sum of the number of protons and neutrons of an atom.
Define the term Atomic number.
FILL IN THE BLANK
The electrons revolving in shells close to the nucleus are called ................... electrons.
FILL IN THE BLANK
In an atom, the last shell containing electrons is called its..................shell.
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.
WRITE SHORT ANSWER
Name the isotopes of hydrogen.
Compare an electron, a proton and a neutron in respect of their relative masses and charges.
Define the term Valence shell.
Explain how the modern atomic theory contradicted Dalton’s atomic theory.
If an atom ‘A’ has an atomic number of eleven, state the number of protons and electrons it contains.
