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प्रश्न
Define the following term:
Atom
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उत्तर
An atom is the smallest particle of an element which retains its chemical identity in all physical and chemical changes.
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?
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Define:- Radicals
Write the names of the elements present in the:-
Glucose
Write the names of `"Ca"("NO"_3)_2` compounds :
Fill in the blank
An ion with positive charge is called ______
Name two particles found inside the nucleus. What are they collectively called ?
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
What are the building blocks of matter ?
What value has been given to the mass of this reference atom ?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
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)
Electron, proton, neutron are the types of ______ in an atom.
The electron shell ______ is nearest to the nucleus.
What is the contribution of the following in atomic structure?
Maharshi Kanada
Name the gas that.
Turns moist starch iodide paper blue black.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
The ______ are combination of atoms of various elements or the same element.
