Chemistry Study Guide Test #5

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What is an atom?

Smallest particles of an element that retains the chemical identity of that element
State the Law of Constant Composition

A given compound will always have the same elements in the same proportions by mass.
State Dalton's Atomic Theory of Matter
- 1. Each element is composed of small particles called atoms.
- 2. All atoms of a given element are identical but differ from those any other element.
- 3. In a chemical reaction, atoms are neither created nor destroyed.
- 4. A given compound always has the same relative numbers and kinds of atoms.
How many elements are there approximately?

100
Faraday first suggested a relationship between atoms and _____________.

Electricity
Where does static electricity come from?

From electrical charges NOT in motion
A ___________ consists of electrons

Cathode Ray
Who discovered the electron?

J.J. Thomson
Who discovered the charge of the electron?

Millikan
Who discovered radioactivity?

Berquerel
Who named the core of the atom the nucleus?

Rutherford
What are the 3 parts of the atom and their charges?

Proton (+), Neutron (0), Electron (-)
Which part of the atom has the same number as the atomic number?

Protons
How is the charge of an ion found?

Number of protons - number of electrons
How is the mass number of an element calculated?

Number of protons + number of neutrons
What is an ion?

Atom with unequal number of protons and electrons
What type of force holds protons together?

Strong nuclear force
What are isotopes?

Atoms with the same number of protons, but different number of neutrons and atomic mass.
What are the 3 types of radioactive decay?

Alpha, Beta, Gamma
Which atomic particle has atomic number -1 and mass number 0?

Beta
Which atomic particle has atomic number 2 and mass number 4?

Alpha
An alpha particle has atomic number _____ and atomic mass number ______.

2, 4
A helium nucleus is the same as a(n) _____________ particle.

Alpha

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gerardcb

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Chemistry Study Guide Test #5

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Updated

2010-09-30T00:43:54Z