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CHEMISTRY [1 Mark Question Answer]

Atomic Structure · ICSE STD 8 (ICSE - English Medium). 16 questions.

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[1 Mark Question Answer]

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16 questions · timed · auto-graded

Question 31 Mark
Define the term Mass number.
Answer
Mass number refers to the sum of the number of protons and neutrons present in the nucleus of an atom and denoted by A Mass number $=$ Number of protons $+$ Number of neutrons.
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Question 41 Mark
Define the term Atomic number.
Answer
Atomic number refers to the number of protons present in an atom. It is denoted by $Z$. Example: An atom of oxygen contains $8$ proton Therefore its atomic number is $8$.
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Question 51 Mark
Give the following a suitable word$/$phrase. The smallest unit of an element which takes part in a chemical reaction.
Answer
Atom
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Question 61 Mark
Give the following a suitable word$/$phrase. Atoms of same element with same atomic number but a different mass number.
Answer
Isotopes
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Question 71 Mark
Give the following a suitable word$/$phrase. The sum of the number of protons and neutrons of an atom.
Answer
Mass number
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Question 81 Mark
Give the following a suitable word$/$phrase. The number of protons present in the nucleus of an atom.
Answer
Atomic number
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Question 91 Mark
Give the following a suitable word$/$phrase Arrangement of electrons in the shells of an atom.
Answer
Electron configuration is the distribution of electrons of an atom in various shells or orbits of the atom $(\text{K, L, M},$  etc$).$
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Question 101 Mark
Give the following a suitable word$/$phrase. The electrons present in the outermost shell.
Answer
This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.
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Question 111 Mark
Give the following a suitable word$/$phrase. Protons and neutrons present in the nucleus.
Answer
Term for protons and neutrons present in nucleus is nucleons
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Question 121 Mark
Give the following a suitable word$/$phrase The sub$-$atomic particle with negative charge and negligible mass.
Answer
Electron - A sub$-$atomic particle with a negative charge and negligible mass.
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Question 131 Mark
What are orbits or shells of an atom?
Answer
The circular orbits $($shell present$)$ in the space available around the nucleus on which electrons revolve are called orbits or shells of an atom.
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Question 141 Mark
Where is the nucleus of an atom situated?
Answer
The nucleus is a centrally located positively charged mass.
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Question 151 Mark
What are the two main parts of which an atom is made of ?
Answer
$1.$ The centrally located nucleus
$2.$ The outer circular orbits.
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Question 161 Mark
The atom of an element is made up of $4$ protons, $5$ neutrons and $4$ electrons. What is its atomic number and mass number?
Answer
Protons $= 4$, neutrons $= 5$, electrons $= 4$
Atomic number $= 4,$
Mass number $= 4 + 5 = 9$
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[1 Mark Question Answer] - CHEMISTRY STD 8 Questions - Vidyadip