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प्रश्न
An element is composed of ______ atoms.
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उत्तर
An element is composed of same kind of atoms.
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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?
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
WRITE SHORT ANSWER
Define an ionic compound.
WRITE SHORT ANSWER
Name three inert gases.
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Define:- Atom
Write the names of `"FeS"` compounds :
Define: Ions
Name the three subatomic particles present in an atom.
What is an atom ? How do atoms usually exist ?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
Select the correct answer to the statement given below:
Imaginary path around the nucleus of an atom in which electrons revolve.
The smallest particle of matter that can exist by itself is ______.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Which of the following has maximum number of atoms?
The smallest unit of an element is ______.
______ is a substance that is made up of three oxygen atoms chemically combined.
Atoms have a radius of the order ______.
