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K: Potassium:: C: ______. - Science

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प्रश्न

K: Potassium:: C: ______.

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उत्तर

K: Potassium:: C: Carbon.

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पाठ 4: Atomic Structure - Evaluation [पृष्ठ ५१]

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सामाचीर कलवी Science - Term 1 [English] Class 7 TN Board
पाठ 4 Atomic Structure
Evaluation | Q V. 3. | पृष्ठ ५१

संबंधित प्रश्‍न

TRUE \ FALSE

Elements having a tendency to accept electrons are called metals

 


TRUE \ FALSE

Cathode rays are a stream of fast moving particles that travel in random directions.


WRITE SHORT ANSWER

What is radioactivity?


ANSWER IN DETAIL

State the postulates of the Dalton’s atomic theory.


Define:- Atom


Write the names of the elements present in the:- 

Glucose


Write the names of `("NH"_4)_2"SO"_4` compounds:


Define: Mass number


Define: Relative atomic mass


 Give the charge and the mass of an electron, proton and neutron present in an atom ?


Name two particles found inside the nucleus. What are they collectively called ?


Who originated the word ‘atom’ ?


How did Neils Bohr visualise the atom ?


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 ?


Fill in the blank

If an atom gains an electron, it is called an _______


Fill in the blank

A deficiency of electrons produces a ________ charge.


Why is it not possible to see an atom even with the most powerful microscope ?


For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.


Name the gas that.

Turns moist starch iodide paper blue black.


Select the correct answer to the statement given below:

Imaginary path around the nucleus of an atom in which electrons revolve.


Name the sub-atomic particles.


Draw the structure of an atom and explain the position of the sub-atomic particles.


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.


Atoms of different elements having the same number of ______ are called isotones.


Does the solubility of a substance change with temperature? Explain with the help of an example.


The smallest unit of an element is ______.


An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.


What are the 3 most abundant atoms on the earth?


The first scientific theory about atoms was given by J J. Thomson.


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