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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
Why is it not possible to see an atom with naked eyes?
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
Write the names of the elements present in the :-
Sulphuric acid
Fill in the blank
An ion with positive charge is called ______
Define: Relative atomic mass
Name the unit in which the radius of an atom is usually expressed.
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Electron, proton, neutron are the types of ______ in an atom.
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
The smaller particles found in the atom is called ______.
K: Potassium:: C: ______.
Define the following term with an example.
Non-metal
An element is composed of ______ atoms.
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?
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
- Rutherford’s atomic model
- Thomson’s atomic model
- Bohr’s atomic model
The graphite refill used is pencil is made of element called ______.
Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges.
Statement II: Atoms of each element are stable and emit their characteristic spectrum.
In the light of the above statements, choose the most appropriate answer from the options given below:
