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CHEMISTRY [1 Mark Question Answer]

Unit - 4.2 Geometric Representation of Atomic Structure · ICSE STD 8 (ICSE - English Medium). 6 questions.

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[1 Mark Question Answer]

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6 questions · timed · auto-graded

Question 11 Mark
How can you determine number of neutrons in the nucleus of an atom from the knowledge of mass number and atomic number?
Answer
The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. In other words, the numbe neutrons in any atom is its mass number minus its atomic number.
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Question 21 Mark
Write the correct statements:
Helium, a noble gas has eight electrons in its valence shell.
Answer
Helium, a noble gas has eight electrons in its outermost shell.
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Question 31 Mark
Write the correct statements:
The electronic configuration of ${ }_{19} K^{39}$ is $2,9,8$.
Answer
The electronic configuration of ${ }_{19} K^{39}$ is $2,8,8$.
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Question 41 Mark
Write the correct statements:
Deuterium an isotope of hydrogen has two neutrons in its nucleus.
Answer
Deuterium an isotope of hydrogen has three neutrons in its nucleus.
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Question 51 Mark
Write the correct statements:
The atoms of different elements having same mass number, but different atomic number are called isotopes.
Answer
The atoms of different elements having same mass number, but different atomic number are called isobars.
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Question 61 Mark
Write the correct statements:
M-shell of an atom can have maximum of eight electrons.
Answer
M-shell of an atom can have maximum of 18 electrons.
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[1 Mark Question Answer] - CHEMISTRY STD 8 Questions - Vidyadip