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प्रश्न
Name the unit in which the radius of an atom is usually expressed.
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उत्तर
The radius of an atom is usually expressed in nanometre (nm).
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संबंधित प्रश्न
TRUE \ FALSE
Neils Bohr gave the theory to explain the arrangement of protons in an atom.
WRITE SHORT ANSWER
Define an ionic compound.
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Define:- Atom
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
Fill in the blank
A charged particle is called an _____
How many times is a proton heavier than an electron?
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.
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
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 positive ion?
Define the following term with an example.
Metal
Define the following term with an example.
Metalloid
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
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
The most abundant type of atom is the universe is ______.
What is the fundamental particle of an element?
