Advertisements
Advertisements
प्रश्न
What is an atom ? How do atoms usually exist ?
Advertisements
उत्तर
Atoms are building blocks of all matter. They are the smallest particles of elements that can take part in a chemical reaction.
Atoms usually exist in combined form, in two ways:
- in the form of molecules
- in the form of ions
APPEARS IN
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 the names of the elements present in the:-
Ammonia
Write the names of `"FeS"` compounds :
Define: Mass number
Define: Relative atomic mass
Give the charge and the mass of an electron, proton and neutron present in an atom ?
Define: Covalent bond
Define: An Atom:
Fill in the blank
A charged particle is called an _____
Why is it not possible to see an atom even with the most powerful microscope ?
Is it possible to see atoms these days ? Explain your answer.
Electron, proton, neutron are the types of ______ in an atom.
In what respects do the three isotopes of hydrogen differ? Give their structures.
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –
- ammonium
- bisulphate
- carbonate
state the group of atoms present in each radical.
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.
