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प्रश्न
What does an atom consist of ? Explain.
उत्तर
An atom consists protons, electrons and neutrons. Protons are positively charged, electrons have negative charge while neutrons have no charge
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संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Write the names of the elements present in the :-
Sulphuric acid
Define: Ions
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.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X ?
Fill in the blank
An _______ is electrically neutral.
Fill in the blank
A deficiency of electrons produces a ________ charge.
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
State true or false. If false, correct the statement.
An atom is electrically neutral.
Define – Atom.
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.
Atoms of one element can be transmuted into atoms of other elements by ______
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
