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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
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:-
Acetic acid
Fill in the blank
An ion with negative charge is called _______
Give two examples for each of ionic and covalent bond.
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?
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
Fill in the blank
An excess of electrons produces a ________ charge.
Is it possible to see atoms these days ? Explain 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.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
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.
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
K: Potassium:: C: ______.
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
Which of the following statements made by Dalton has not undergone any change?
A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
The smallest unit of an element is ______.
______ is a substance that is made up of three oxygen atoms chemically combined.
