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Structure of the Atom · MP Board (MPBSE) STD 9 (Madhya Pradesh - English Medium). 25 questions.

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25 questions · timed · auto-graded

Question 11 Mark
Complete the following statements: Isotopes have different mass numbers because their nuclei contain different number of _________.
Answer
Isotopes have different mass numbers because their nuclei contain different number of neutrons.
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Question 21 Mark
Fill in the following blanks:
Atomic number Mass number Protons Neutrons Electrons Symbol
$10$ $22$ ............ ............ ............ ............
Answer
Atomic number Mass number Protons Neutrons Electrons Symbol
$10$ $22$ $10$ $12$ $10$ $Ne$
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Question 31 Mark
Fill in the following blanks in respect of an atom of an element:
No. of Protons
No. of Neutrons
Mass number
Atomic number
No. of electrons
Symbol
$11$
$12$
............
............
............
............
Answer
No. of Protons
No. of Neutrons
Mass number
Atomic number
No. of electrons
Symbol
$11$
$12$
$23$
$11$
$11$
$Na$
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Question 41 Mark
Fill in the blanks in the following statements: The total number of protons and neutrons in the nucleus of an atom is called its __________.
Answer
The total number of protons and neutrons in the nucleus of an atom is called its Mass number.
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Question 51 Mark
Fill in the blanks in the following statements: The subatomic particle not present in a hydrogen atom is _________.
Answer
The subatomic particle not present in a hydrogen atom is Neutron.
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Question 61 Mark
Fill in the blanks in the following statements: The maximum number of electrons that can be accommodated in L shell are __________.
Answer
The maximum number of electrons that can be accommodated in $L$ shell are 8.
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Question 71 Mark
Fill in the blanks in the following statements:
Rutherford’s $\alpha $-particle scattering experiment led to the discovery of the ______
Answer
Rutherford’s $\alpha $-particle scattering experiment led to the discovery of the nucleus.
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Question 81 Mark
Fill in the blanks in the following statements: The maximum number of electrons that can go into the $M$ shell is __________.
Answer
The maximum number of electrons that can go into the $M$ shell is 18.
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Question 91 Mark
Fill in the blanks in the following statements: The number of protons in the nucleus of an atom is called its __________.
Answer
The number of protons in the nucleus of an atom is called its Atomic number.
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Question 101 Mark
Fill in the blanks in the following statements:
The anode rays obtained form hydrogen gas consist of particles called __________.
Answer
The anode rays obtained form hydrogen gas consist of particles called Protons.
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Question 111 Mark
In neutral atoms, number of electrons are equal to number of ________.
Answer
In neutral atoms, number of electrons are equal to number of protons. Explanation: The number of electrons in a neutral atom is equal to the number of protons.
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Question 121 Mark
Fill in the blanks in the following statements:
The electronic configuration of silicon is _________ and that of sulphur is _________.
Answer
The electronic configuration of silicon is 2, 8, 4 and that of sulphur is 2, 8, 6.
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Question 131 Mark
Complete the following statements: Some boron atoms have mass number $10$ and some have mass number $11$. These boron atoms with different mass number are called ____________.
Answer
Some boron atoms have mass number $10$ and some have mass number $11$. These boron atoms with different mass number are called isotopes.
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Question 141 Mark
Fill in the blanks in the following statements: The electron has ________ charge, the proton has _________ charge, and the neutron has _________ charge.
Answer
The electron has Negative charge, the proton has Positive charge, and the neutron has No charge.
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Question 151 Mark
Fill in the blanks in the following statements: Cathode rays are a beam of fast moving __________.
Answer
Cathode rays are a beam of fast moving Electrons.
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Question 161 Mark
Fill in the blanks in the following statements: An atom has atomic mass number $23$ and atomic number $11$. The atom has __________ Electrons.
Answer
An atom has atomic mass number $23$ and atomic number $11$. The atom has 11 Electrons.
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Question 171 Mark
Fill in the blanks in the following statements:
Neon and chlorine have atomic numbers $10$ and $17$ respectively. Their valencies will be _________ and _________ respectively.
Answer
Neon and chlorine have atomic numbers $10$ and $17$ respectively. Their valencies will be Zero and one respectively.
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Question 181 Mark
Fill in the following blanks in respect of an atom of an element:
Number of protons
Number of neutrons
Mass number
Atomic number
Number of electrons
Valency
$11$
$12$
..............
..............
..............
..............
Answer
Number of protons
Number of neutrons
Mass number
Atomic number
Number of electrons
Valency
$11$
$12$
23
11
11
1
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Question 191 Mark
Fill in the blanks in the following statements: Almost all the mass of an atom is concentrated in a small region of space called the __________.
Answer
Almost all the mass of an atom is concentrated in a small region of space called the Nucleus.
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Question 201 Mark
Fill in the blanks in the following statements: An atom of an element has $11$ protons, $11$ electrons and $12$ neutrons. The atomic mass of the atom is __________.
Answer
An atom of an element has $11$ protons, $11$ electrons and $12$ neutrons. The atomic mass of the atom is 23.
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Question 211 Mark
Complete the following statements: The valency of nitrogen in $\mathrm{N}_2$ molecule is ________.
Answer
The valency of nitrogen in $\mathrm{N}_2$ molecule is 3.
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Question 221 Mark
Complete the following statements: Magnesium has $3$ valence electrons in the ________ shell.
Answer
Magnesium has $3$ valence electrons in the M shell.
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Question 231 Mark
Fill in the blanks in the following statements: If the nucleus of an atom has atomic number $17$, mass number $37$ abd there are $17$ electrons outside the nucleus, the number of neutrons in it is ____________.
Answer
If the nucleus of an atom has atomic number $17$, mass number $37$ abd there are $17$ electrons outside the nucleus, the number of neutrons in it is 20.
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Question 241 Mark
The fundamental particle not present in hydrogen is ________.
Answer
The fundamental particle not present in hydrogen is Neutrons. Explanation: In nucleus of an atom, protons and neutrons are present. But in hydrogen atom, neutrons are not present, only 1 proton is present.
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Question 251 Mark
Fill in the blanks in the following statements:
Isotopes have same ______ but different ______.
Answer
Isotopes have same atomic number but different mass number.
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