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प्रश्न
A compound containing one atom of carbon and two atoms of oxygen is ______.
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उत्तर
A compound containing one atom of carbon and two atoms of oxygen is CO2
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संबंधित प्रश्न
WRITE SHORT ANSWER
What is radioactivity?
Write the names of the elements present in the following compound.
Common salt
Define: Chemical bond
Name two particles found inside the nucleus. What are they collectively called ?
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
State Dalton’s atomic theory.
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
Fill in the blank
An _______ is electrically neutral.
Name the three subatomic particles present in an atom.
Name the unit in which the radius of an atom is usually expressed.
Write the relation between nanometre and metre.
How many times is a proton heavier than an electron?
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 element will gain electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Give the salient features of “Modern atomic theory”.
The first scientific theory about atoms was given by J J. Thomson.
