Protons and Electrons
What does the atomic number tell us?
The number of protons in an atom.
What does a mass number represent?
The number of protons and neutrons in the nucleus.
What is the electron configuration for He?
1s2
Two positive electrical charges will ______________
Repel
What was the name of the model of the atom developed by Thompson?
The plum pudding model
If the atomic number of an atom is 15, how many electrons does it have?
15. The number of protons and electrons are the same in neutral atoms
If Carbon has 7 neutrons, what is it's mass number?
13
What is the element represented by this electron configuration? 1s22s22p63s23p4
S - Sulfur
What is the particle/wave duality theory?
The theory that light sometimes acts like a particle and other times like a wave.
Who proposed the first planetary model of an atom?
What is the atomic number of Nickel (Ni)?
28
What is an isotope?
Atoms with the same number of protons but different number of neutrons. Their chemistry is the same but their masses are different.
What is the FULL electron configuration for Silver?
1s22s22p63s23p64s23d104p65s24d9
Which color has the shorter wavelength: yellow or green? (remember ROYGBIV)
Green
How many electron different types of electron orbitals are there? Name them
4- s,p,d,f
The Crookes's tube confirmed the existence of what atomic particle?
electron
If the mass number of a certain element is 42 and the atomic number is 20, what is the element and how many neutrons, protons and electrons does it have?
Calcium- 20 protons, 20 electrons and 22 neutrons
What element is represented by this abbreviated electron configuration? [Ar] 4s23d104p4
Se (Selenium)
If the energy of light emitted from an atom is 3.4x10-15 J, What is the wavelength?
Hint- find frequency first.
5.6x10-11m
Frequency= 5.4x1018Hz
How many electrons fill each of the d orbitals?
10
True or false- Matter tries to stay at it's highest energy state.
False. All forms of matter try to stay to the lowest possible energy state
What is the artificially increasing the amount of a specific isotope called? We use this to create atomic bombs.
Isotope enrichment
What is the electron configuration for gold? You can use either method
[Xe]6s24f145d9
What color of light has a frequency of 5.4 x1014 Hz?
Hint- Find wavelength and convert from m to nm.
WV is 556 nm so the color between yellow and green
What is a physical constant?
A measurable quantity that does not change. (i.e. The speed of light)