Advertisements
Advertisements
प्रश्न
Fill in the blank
An excess of electrons produces a ________ charge.
Advertisements
उत्तर
An excess of electrons produces a negative charge.
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
WRITE SHORT ANSWER
Name three inert gases.
Define:- Molecule
Write the names of the elements present in the:-
Acetic acid
Write the names of `"Na"_3"PO"_4` compounds :
Define: Relative atomic mass
What are orbits or shells ?
Name three non-metals/radicals which have valency -1, -2, and -3.
Give two examples for each of ionic and covalent bond.
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
Is it possible to see atoms these days ? Explain your answer.
One nm is equal to :
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
In what respects do the three isotopes of hydrogen differ? Give their structures.
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
The smallest particle of matter that can exist by itself is ______.
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
The number of atoms present in a molecule is called its ______.
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?
