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Questions and Answers
What is the name of Lana Zakir's father?
Which standard is Lana Zakir studying in?
What is the full name of Lana Zakir's mother?
Which of the following statements is true?
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What information about Lana Zakir can be inferred?
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What does the atomic mass number represent in an atom?
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Which particle was discovered by JJ Thomson?
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Isobars are defined as elements that have:
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What characterizes the fixed energy levels in Bohr's model of the atom?
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When comparing the properties of cathode rays, which statement is correct?
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Study Notes
Subatomic Particles
- Protons are positively charged ions, while electrons are negatively charged ions.
- Neutrons carry no charge and are considered neutral particles.
- Subatomic particles are components found within an atom.
Discovery of Subatomic Particles
- The proton was discovered by Eugene Goldstein.
- JJ Thomson identified the electron as a fundamental particle.
- James Chadwick is credited with the discovery of the neutron.
Cathode Rays
- Cathode rays consist of electrons and are produced through discharge tube experiments.
- They travel in straight lines and possess mass, demonstrating particle-like properties.
Atomic Structure
- The atomic number (Z) indicates the number of protons in an atom.
- The mass number (A) is the total of protons and neutrons in an atom.
- In a neutral atom, the number of protons equals the number of electrons.
- The number of neutrons can be calculated by subtracting the atomic number from the mass number (A-Z).
Hydrogen Isotopes
- Hydrogen has three isotopes: protium, deuterium, and tritium.
- Isotopes have the same atomic number but differing masses, while isobars share the same mass number but different atomic numbers.
Bohr's Model of the Atom
- According to Bohr's model, electrons orbit the nucleus in fixed paths known as energy shells.
- Each electron shell has a defined energy level, leading to the term "fixed energy levels."
- The energy of an electron increases as its distance from the nucleus increases.
Studying That Suits You
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Description
Test your knowledge on personal introductions and family structures with this quiz aimed at 10th standard students. Explore how to effectively present personal information in a clear and concise manner. Perfect for developing communication skills in academic settings.
