J.J. Thomson's work with the cathode ray tube led him to discover...
Negatively charged particles (electrons) with very little mass
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20
Why isn't it possible to have an isotope of Cadmium-112.41?
112.41 is the atomic mass, an average of all isotopes. Isotopes would have a whole numbered mass.
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10
In a neutral atom, what 2 subatomic particles are equal to the atomic number?
Protons & electrons.
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15
Is this atom neutral? Why?
Yes, because it has the same number of protons and electrons.
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15
What is the mass number of this atom?
11
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15
Compared to protons, neutrons have...
No charge and about the same mass.
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15
What is the atomic number of this atom?
5
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15
What element is atom A?
Sodium
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20
An iron nail with a mass of 2.3 g sits in a chamber of oxygen until rust (iron oxide) forms. After the reaction, the rusted nail has a mass of 2.8 g. What is the percent composition of iron in this rust?
82% Iron
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15
What is the mass number of atom B?
7
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15
What element is pictured here?
Boron
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15
An iron nail with a mass of 2.3 g sits in a chamber of oxygen until rust (iron oxide) forms. After the reaction, the rusted nail has a mass of 2.8 g. What mass of oxygen must have reacted?