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प्रश्न
The smallest particle of matter that can exist by itself is ______.
उत्तर
The smallest particle of matter that can exist by itself is atom.
APPEARS IN
संबंधित प्रश्न
If bromine atom is available in the form of, say, two isotopes `""_35^79Br (49.7%)" and """_35^81Br (50.3%)`, calculate the average atomic mass of bromine atom.
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
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:-
Sodium hydroxide
Write the names of `("NH"_4)_2"SO"_4` compounds:
Fill in the blank
An ion with positive charge is called ______
Define: Chemical bond
Name the particles which revolve around the nucleus.
What does the word ‘atom’ mean?
Name the particle or particles you would expect to find in :
The orbit of an atom
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
How is the size of an atom indicated ?
Write the relation between nanometre and metre.
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.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
Define the following term with an example.
Element
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
Name the sub-atomic particles.
Define the following term with an example.
Compound
In all atoms of an element
An element is composed of ______ atoms.
Define the term ions or radicals.
The volume occupied by 4.4 g of CO2 at S.T.P ______
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
