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प्रश्न
What are orbits or shells ?
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उत्तर
The fixed circular paths along which electrons revolve round the nucleus.
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संबंधित प्रश्न
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
Define:- Molecule
Write the names of the elements present in the :-
Sulphuric acid
Write the names of `("NH"_4)_2"SO"_4` compounds:
Fill in the blank
An ion with positive charge is called ______
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
Fill in the blank
If an atom gains an electron, it is called an _______
Fill in the blank
An excess of electrons produces a ________ charge.
Name the unit in which the radius of an atom is usually expressed.
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
State true or false. If false, correct the statement.
An atom is electrically neutral.
Draw the structure of an atom and explain the position of the sub-atomic particles.
Define the following term with an example.
Metal
______ is the smallest particle of an element.
Atoms of one element can be transmuted into atoms of other elements by ______
1 mole of Gold and Silver contain same number of atoms.
What is the fundamental particle of an element?
