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प्रश्न
What are the building blocks of matter ?
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उत्तर
Atoms and molecules are the building blocks of matter.
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संबंधित प्रश्न
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Write the names of the elements present in the following compound.
Common salt
Write the names of the elements present in the:-
Ammonia
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Define: Covalent bond
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
What value has been given to the mass of this reference atom ?
An atom of an element X may be written as `""_9^4"X"`
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom X?
(d) What is the number of neutrons in atom X?
(e) What is the number of electrons in atom X?
(f) How many electrons are there in the outermost shell of an atom of element X?
(g) Write the symbol of ion formed by an atom of element X.
In what respects do the three isotopes of hydrogen differ? Give their structures.
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
Define the following term with an example.
Element
In all atoms of an element
An element is composed of ______ atoms.
Define the term ions or radicals.
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
The number of atoms present in a molecule is called its ______.
1 mole of Gold and Silver contain same number of atoms.
Give the salient features of “Modern atomic theory”.
A change in the physical state can be brought about
