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प्रश्न
Define:- Molecule
उत्तर
Molecule : Molecule is the smallest unit of a compound (or an element) which always has an independent existance.
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संबंधित प्रश्न
Write the names of the elements present in the:-
Ammonia
Write the names of the elements present in the:-
Glucose
Fill in the blank
An ion with negative charge is called _______
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Why is it not possible to see an atom even with the most powerful microscope ?
How many times is a proton heavier than an electron?
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.
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
Which of the following statement is correct about the atom of an element ?
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
A compound containing one atom of carbon and two atoms of oxygen is ______.
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
Name the sub-atomic particles.
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
- Rutherford’s atomic model
- Thomson’s atomic model
- Bohr’s atomic model
The smallest unit of an element is ______.
What are the 3 most abundant atoms on the earth?
