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Science [ 2 Marks Questions ]

T1 CH4 Atomic Structure · Tamil Nadu Board STD 7 (Tamil - English Medium). 11 questions.

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Question 12 Marks
Distinguish isotopes from isobar
Answer
Sr. No.IsotopesIsobar
1.Isotopes are atoms of the same element thus having same atomic number but different mass number.Isobars are such atoms which have same mass number but different atomic numbers. Thus isobars are different elements
2.Example: Hydrogen has three isotopes protium, with deuterium, tritium atomic number 1 but mass number 1,2,3.Example: Calcium and Argon are isobars as they have atomic number 20 and 18 but their mass number is 40.
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Question 22 Marks
Why neutrons are called neutral particles?
Answer
Neutrons are the particles in an atom that have a neutral change (no charge). They are not positive like protons. They are not negative like electrons. So they are called as neutral particles.
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Question 32 Marks
Define valency. What is the valency of the element with atomic number 8? What is the compound format by this element with hydrogen?
Answer
valency
  1. Valency is defined as the combining capacity of an element.
  2. Valency of the element with atomic number: 8 Name of the element:

Oxygen : 0
Atomic number: 8
Valency: 2
Water $\left( H _2 O \right)$ is the Oxide of Hydrogen and most familiar oxygen compound
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Question 42 Marks
How Rutherford’s model is different from that proposed by J.J. Thomson?
Answer
According to Rutherford, most of the mass is concentrated is a small central part of the atom whereas J.J. Thomson thought that mass was uniformly distributed in the atom.
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Question 52 Marks
In Rutherford experiment of scattering of alpha particles, can we take foil of any other metal instead of gold?
Answer
  1. Yes, we can take foil of any other metal that is highly malleable because for this experiment we need a very thin foil.
  2. Gold was used because it is highly malleable, the gold foil taken was about 1000 atoms thick.
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Question 62 Marks
What are the limitations of Thomson’s model of an atom?
Answer
J. J. Thomson’s theory does not propose anything about the positive and negative charges of an atom. Hence , it was not able to explain many of the properties of substances.
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Question 72 Marks
Define Isobars. Give example.
Answer
Atoms that have the same mass number but different atomic numbers are called Isobars.
Eg: Calcium – 40 and Argon – 40.
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Question 82 Marks
Define isotopes. Give example.
Answer
Atoms of the same element can have different number of neutrons. Such atoms will have same atomic number but different mass numbers. These atoms are called isotopes. For example Hydrogen has three isotopes – Hydrogen,Deuterium,Tritium
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Question 92 Marks
what is atomic mass number? mention its formula.
Answer
Atomic mass number (A) is equal to the sum of the number of protons(p) and neutrons (n) in the nucleus.
Atomic mass or mass number = Number of Protons + Number of Neutrons
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Question 112 Marks
Is the structure of the atom the same as the structure of the solar system.
Answer
Yes It is similar to the solar system. It has a core center called nucleus and it has paths called orbits around the nucleus.
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[ 2 Marks Questions ] - Science STD 7 Questions - Vidyadip