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प्रश्न
What is an atom ? How do atoms usually exist ?
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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
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संबंधित प्रश्न
WRITE SHORT ANSWER
Define an ionic compound.
Write the names of the elements present in the :-
Sulphuric acid
Write the names of `"Na"_3"PO"_4` compounds :
Name the particle or particles you would expect to find in :
The nucleus of an atom
Define: An Atom:
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
Name the three subatomic particles present in an atom.
Electron, proton, neutron are the types of ______ in an atom.
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
The smaller particles found in the atom is called ______.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
In all atoms of an element
A change in the physical state can be brought about
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
______ is a substance that is made up of three oxygen atoms chemically combined.
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
