Ch3 Flashcards
Define atomic number
The number of protons in a element
What is the purpose of the proton in the atom
They idetify a specific atom in a element (atomic #)
Which subatomic paricle is the most massive
Neutron
What is the 2nd biggest subatomic particle
Proton
What is the current model of a atom called
Quantum mechanical model
Descride the bohr model
A model that explains that electrons are in spherical engery levels or orbits at fixed distances
Describe the experiment that led to the discovery of the nucleus. Who did this?
Alpha particles shot at gold foil; ernest rutherford
Who discoverd the electron
Jj thomson
What did ernest rutherford discover
Nucleus and proton
What was jj rhomson model called
Plum pudding model
What is the difference between orbits and orbitals
Orbits: have a distinet (set) pathway
Orbital: aera of high probability
Define the word ion
Charged ion (+ or -)
How does a ion form
A gain of loss of a electron
What are 2 types of ions
Anions (-) and cations (+)
Define the word isotope
Is a type of element with the same amount if protons but diferent amount of neutrons
Where is a charge written when writing a element in isotope notation
Upper right
Do isotopes have similar or diferent properities
Different properties
2 of selenium’s stable isotopes are selenium - 78 and selenium - 79. The atomic mass of selenium is 78.79. Which isotopr is more common
Selenium - 79
How many neutrons dies chlorine - 18 have?
1 neutron
How is Nitrogen - 14 different from Nitrogen - 15
Mass # is different because of more neutrons
One isotope of iodine has 53 protons and 55 neutrons. What is the name lf the isotope
Iodine - 108
