Atom and It's Structure
Presentation
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Chemistry
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10th - 11th Grade
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Practice Problem
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Medium
Sajini De Alwis
Used 7+ times
FREE Resource
11 Slides • 7 Questions
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Atom and It's Structure
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Multiple Choice
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Multiple Choice
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Multiple Choice
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The Atom
The 'building blocks' of all matter.
Composed of three subatomic particles.
- Protons
- Neutrons
- Electrons
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Multiple Choice
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Subatomic Particles
Nucleus: protons and neutrons bound in the centre - contains most of the atom's mass.
Subatomic particles in the nucleus are referred to as Nucleons.
Protons and neutrons are almost ideantical in mass.
Electrons are 1800 times smaller than the nucleons.
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Multiple Choice
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Standard way of representing an atom
Mass number = Protons + Neutrons
Atomic number = Number of protons
Number of protons = number of electrons.
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Which indicates:
Protons: 13
Electrons: 13
Neutrons: 27 - 23 = 14
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Calculate the number of protons, neutrons and electrons for Argon:
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Calculated the number of subatomic particles for Uranium:
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Isotopes
Atoms that have the same number of protons but different number of neutrons (therefore different mass numbers).
- The average atomic mass of elements is the average of all of its isotopes, this is the reason why its a decimal value.
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Multiple Choice
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Carbon-12, Carbon-13 and Carbon-14 are natural isotopes.
Carbon-14 is radioactive
Atom and It's Structure
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