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प्रश्न
In all atoms of an element
पर्याय
the atomic and the mass number are same.
the mass number is same and the atomic number is different.
the atomic number is same and the mass number is different
both atomic and mass numbers may vary
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उत्तर
The atomic and the mass number are same.
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संबंधित प्रश्न
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
WRITE SHORT ANSWER
Define an ionic compound.
Write the names of the elements present in the following compound.
Common salt
Write the names of the elements present in the:-
Acetic acid
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.
(Atomic masses : Al = 27 u ; Fe = 25 u)
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
Define the following term with an example.
Non-metal
Does the solubility of a substance change with temperature? Explain with the help of an example.
Write any two observations which support the fact that atoms are divisible.
