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प्रश्न
Define: Relative atomic mass
उत्तर १
Relative atomic mass— Relative atomic mass is the mass of an atom of an element as a multiple of the standard atomic mass unit.
उत्तर २
The relative atomic mass of an element is the ratio between the average mass of its isotopes to 1/12th part of the mass of a carbon – 12 atoms. It is denoted as Ar.
Relative atomic mass = `" Average mass of the isotopes of the element"/(1"/"12^{"th"}" of the mass of one Carbon- 12 atom")`
संबंधित प्रश्न
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Write the names of the elements present in the:-
Sodium hydroxide
Give the charge and the mass of an electron, proton and neutron present in an atom ?
What are orbits or shells ?
Name three non-metals/radicals which have valency -1, -2, and -3.
What does the word ‘atom’ mean?
Name the particle or particles you would expect to find in :
The nucleus of an atom
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
Name the unit in which the radius of an atom is usually expressed.
Why is it not possible to see an atom even with the most powerful microscope ?
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
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)
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
Draw the electron dot structure of this compound.
Name the gas that.
Turns moist starch iodide paper blue black.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Define the following term with an example.
Element
The smaller particles found in the atom is called ______.
Name the sub-atomic particles.
Draw the structure of an atom and explain the position of the sub-atomic particles.
Define the following term with an example.
Metalloid
An element is composed of ______ atoms.
Atoms of one element can be transmuted into atoms of other elements by ______
Give the salient features of “Modern atomic theory”.
Write any two observations which support the fact that atoms are divisible.
The ______ are combination of atoms of various elements or the same element.
