EMS
Charge and Mass
Mass and Atomic Number
Experiments and Scientists
Misc.
100
What is the wavelength and frequency for visible light?
Wavelength - 10^-6 m
Frequency - between 10^12 and 10^15 Hz
100
What is the mass and charge of a proton?
1 amu / +
100
The number of protons and neutrons in an atom added together is the __________.
mass number (or atomic mass)
100
This scientist conducted the Cathode Ray Tube experiment to discover negatively charged particles (electrons) in an atom that compliment the positive particles in the nucleus. He proposed the "plum pudding" atomic model to show evenly dispersed electrons surrounding the nucleus.
J.J. Thompson
100
What is the 'job' of protons?
Gives you the type of atom it is OR identifies the type of atom OR is the "fingerprint"
200
ALL waves travel at this speed (numerical value with units)
Speed of light (3 x 10^8 m/s)
200
What is the mass of an electron?
Pretty much weighs nothing (0.0005 amu) or (9.10938356 × 10-28 grams)
200
What is the formula used to find the average atomic mass of an element?
Av Mass = (% X mass) + (% X mass)...
200
This scientist conducted the gold foil experiment to discover a positively charged nucleus in the center of the atom.
Rutherford
200
What is the 'job' of the electrons?
They allow atoms to combine with other atoms (ex. CO2)
300
Where are electrons located?
In energy levels around the nucleus (would also accept orbitals)
300
What is the overall charge of an atom?
Neutral: the number of electrons equals the number of protons
300
What are three pieces of information you can gain from knowing the atomic number of an atom?
The number of protons, the number of electrons, and the identity of an element.
300
Discovered neutrons within the nucleus of an atom
Chadwick
300
What is the 'job' of the neutrons?
Neutrons keep the protons from repelling each other. (Act like glue keeping them together in the nucleus)
400
Are electrons ever in the nucleus? Yes or NO?
No.
400
What is the machine called that can separate isotopes by their weight?
mass spectrometer
400
I have three isotopes of carbon. What do they have in common? How do they differ?
They have the same number of protons, but different number of neutrons (or a different masses)
400
This scientist proposed the idea that an atom is "indivisible".
Dalton
400
How many neutrons does the most abundant isotope of Aluminum have? (round accordingly)
14 neutrons (Weighs 27 amu - 13 protons = 14 neutrons)
500
Electrons orbit the nucleus in the electron cloud. Where (in the cloud) will there be the greatest chance of locating an electron?
Closest to the nucleus.
500
When atoms enter a mass spectrometer, they are stripped of an electron. What does this do to the overall charge of the atom?
It makes it have a +1 charge (because now the # of p+ and e- are not equal).
500
If the mass number of an atom is 23, and the atomic number is 11, how many neutrons does it have?
12
500
This scientist introduced the idea of adding energy levels to for electrons surrounding an atom's nucleus.
Bohr
500
I have not taught you this *technically*, BUT can you figure it out.... How many protons, neutrons, and electrons does this isotope of strontium have?
protons = 38
neutrons = 50
electrons = 36
(the 2+ charge indicates that there are two more protons than electrons)