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प्रश्न
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
विकल्प
Molecule
Orbits
Atom
Valency
Radical
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उत्तर
Atom
APPEARS IN
संबंधित प्रश्न
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
WRITE SHORT ANSWER
Define an ionic compound.
Write the names of `"Na"_3"PO"_4` compounds :
Fill in the blank
An ion with positive charge is called ______
Define: Mass number
Name the particles which revolve around the nucleus.
What does the word ‘atom’ mean?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
How is the size of an atom indicated ?
State two observations which show that atom is not indivisible.
The electron shell ______ is nearest to the nucleus.
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Define – Atom.
Name the sub-atomic particles.
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
Atoms of one element can be transmuted into atoms of other elements by ______
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
The most abundant type of atom is the universe is ______.
The ______ are combination of atoms of various elements or the same element.
