CHEM1211 General review
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30 Terms
When is an atom neutral?
When it has the same number of electrons as protons
When does an atom have a charge?
When it has an unequal amount of protons and electrons.
What is an Ion?
A charged Atom
What is a positively charged ion called?
A cation
What is a negatively charged ion called?
An anion
How do you calculate the charge of an atom?
Charge of an atom = # of protons - # of electrons
Which group of the periodic table consists of Alkali metals?
1st Group
Which group of the Periodic table includes Alkaline earth metals?
2nd Group
Which Group of the Periodic table includes Chalcogens?
16th group
Which group of the Periodic table includes Halogens?
17th group
Which group of the Periodic table includes Noble gases?
18th group
What does an Atomic number represent?
The number of Protons
How do you find the Mass number?
Number of Protons + Number of Neutrons
How do you find Charge?
Number of protons - Number of Electrons
Who discovered electrons?
J. J. Thomson
Where is most of the mass of an atom concentrated?
The Nucleus
Carat is a unit of measurement of what physical property?
Mass
How do you convert from mass to volume (in mL)?
Divide by the density of the object
Formula to find mass
M= Density x Volume
How many cm in an inch?
2.54cm = 1in
Number of protons in an element; identifies the element
Atomic number (Z)
The sum of the number of protons and neutrons
Mass number
What is the measurement of the distance between wave crests called?
Wavelength
What is the measurement of the number of wave crests that pass a stationary point per second?
Frequency
What is the speed of light?
2.998 × 108 m/s
Wavelength is measured in which direction?
Short waves to long.
Frequency is measured in which direction?
High to low
What order do quantum numbers go in?
Principle Quantum number
Angular Momentum
Magnetic
Electron Spin
What information does the Principle Quantum number give?
Information about the size of an electron. About the distance it has from the nucleus and about it’s energy.