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प्रश्न
Write the full form of IUPAC.
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उत्तर
The full form of IUPAC is International Union of Pure and Applied Chemistry.
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संबंधित प्रश्न
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 the elements present in the:-
Glucose
Write the names of the elements present in the:-
Acetic acid
Fill in the blank
An ion with negative charge is called _______
Define: Chemical bond
Give the charge and the mass of an electron, proton and neutron present in an atom ?
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Name the particle or particles you would expect to find in :
The orbit of an atom
Fill in the blank
A charged particle is called an _____
An atom of an element X may be written as `""_9^4"X"`
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom X?
(d) What is the number of neutrons in atom X?
(e) What is the number of electrons in atom X?
(f) How many electrons are there in the outermost shell of an atom of element X?
(g) Write the symbol of ion formed by an atom of element X.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
In what respects do the three isotopes of hydrogen differ? Give their structures.
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
Define the following term with an example.
Element
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
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.
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?
The graphite refill used is pencil is made of element called ______.
