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प्रश्न
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
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उत्तर
(a) Atom: It is the smallest particle of an element, which is made up of only one kind of atom. Atoms are built up of sub-atomic particles protons, neutrons, and electrons.
Example: O - Oxygen atom, H - Hydrogen atom
(b) Molecule: “The smallest particle of a substance which can exist on its own and retains the physical and chemical properties of the substance is called a molecule.”
Example: O2 - Oxygen molecule, H2O - Water molecule
(c) Radical: A radical is an atom of an element or a group of atoms of different elements that behaves as a single unit with a positive or negative charge on it.
Example: \[\ce{NH^+4}\] - Ammonium radical
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संबंधित प्रश्न
ANSWER IN DETAIL
How are isobars different from isotopes ?
Write the names of the elements present in the following compound.
Common salt
Write the names of the elements present in the:-
Ammonia
Fill in the blank
An ion with negative charge is called _______
Define: Mass number
Fill in the blank
A deficiency of electrons produces a ________ charge.
How is the size of an atom indicated ?
Name the unit in which the radius of an atom is usually expressed.
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.
Define the following term:
Atom
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
Define the following term with an example.
Element
The smaller particles found in the atom is called ______.
State true or false. If false, correct the statement.
An atom is electrically neutral.
Which of the following statements made by Dalton has not undergone any change?
In all atoms of an element
Atoms of one element can be transmuted into atoms of other elements by ______
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
