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Question
Define the following term:
Atom
Solution
An atom is the smallest particle of an element which retains its chemical identity in all physical and chemical changes.
RELATED QUESTIONS
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
ANSWER IN DETAIL
How are isobars different from isotopes ?
Define: Chemical 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 atomic numebr of X ?
Name the three subatomic particles present in an atom.
Write the relation between nanometre and metre.
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
What value has been given to the mass of this reference atom ?
Draw the diagrams representing the atomic structures of the following: Neon
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
A compound containing one atom of carbon and two atoms of oxygen is ______.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
______ is the smallest particle of an element.
Does the solubility of a substance change with temperature? Explain with the help of an example.
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
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 first scientific theory about atoms was given by J J. Thomson.
A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n – 1 to t = n. Then, the ratio `S_n/(S_(n + 1))` is ______.
