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H. Chemistry Unit 2 Review
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In a neutral atom, what 2 subatomic particles are equal to the atomic number?
Protons & electrons.
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.
Which atom is an isotope of atom B?
D
What is the mass number of atom B?
7
What element is atom A?
Sodium
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
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?
0.50 g of oxygen
What is the atomic number of this atom?
5
Is this atom neutral? Why?
Yes, because it has the same number of protons and electrons.
What is the mass number of this atom?
11
What element is pictured here?
Boron
Compared to protons, neutrons have...
No charge and about the same mass.
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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