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प्रश्न
Define: Relative atomic mass
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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
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.
TRUE \ FALSE
Neils Bohr gave the theory to explain the arrangement of protons in an atom.
ANSWER IN DETAIL
How are isobars different from isotopes ?
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An ion with negative charge is called _______
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
Define: An Atom:
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If an atom loses an electron, it acquires ______ a charge.
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 ?
What value has been given to the mass of this reference atom ?
Is it possible to see atoms these days ? Explain your answer.
One nm is equal to :
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
Draw the electron dot structure of this compound.
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 negative 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:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
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.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
______ is the smallest particle of an element.
Atoms of different elements having the same number of ______ are called isotones.
1 mole of Gold and Silver contain same number of atoms.
Which of the following has maximum number of atoms?
Does the solubility of a substance change with temperature? Explain with the help of an example.
Lead is also known as plumbum.
Atoms have a radius of the order ______.
