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प्रश्न
How is the size of an atom indicated ?
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उत्तर
The size of an atom is indicated by its radius.
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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.
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
WRITE SHORT ANSWER
Define an ionic compound.
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Write the names of the elements present in the following compound.
Common salt
Write the names of `"FeS"` compounds :
Fill in the blank
An ion with negative charge is called _______
Give the charge and the mass of an electron, proton and neutron present in an atom ?
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
What are the building blocks of matter ?
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
The electron shell ______ is nearest to the nucleus.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
The smallest particle of matter that can exist by itself is ______.
A compound containing one atom of carbon and two atoms of oxygen is ______.
Atoms of different elements having the same number of ______ are called isotones.
The number of atoms present in a molecule is called its ______.
Give the salient features of “Modern atomic theory”.
The smallest unit of an element is ______.
