Atomic Theory Nov 2021 Flashcards
Atom
The fundamental unit of all matter contains protons, neutrons and electrons
Electron and its mass (AMU) and charge
A subatomic particle of negative charge that weighs .000545
Proton and its mass (AMU) and charge
A subatomic particle of positive charge that weighs exactly 1.00000 AMU
Neutron and its mass (AMU) and charge
A subatomic particle of no charge that weighs 1 amu
What is a cation?
An atom that has a positive charge and is missing some electron/s
What is an anion?
An atom that has a negative charge and has extra electron/s
What is an isotope?
A type of atom with specific number of protons and neutrons
If you are given an atomic symbol, like C, what information are you absolutely certain of: number of protons? number of electrons? number of neutrons?
Without the charge information could be an ion so only thing you really know is PROTONS
If you are given an atomic symbol, like C, and a mass number, like 13, what information are you absolutely certain about? number of protons? electrons? neutrons?
Mass number = protons plus neutrons, and from the atomic symbol you know protons. Know nothing about electrons.
What is the mass number and how is it written?
It is the sum of protons plus neutrons, usually C-12 for example (sometimes a superscript)
You are given hydrogen-3 with a positive charge. How many neutrons, protons and electrons does it have?
It has 1 proton (its Hydrogen), 2 neutrons (mass number - protons) and no electrons (+ charge)
You have an element with an atomic number of 14 and a mass number of 30. How many neutrons does it have? What is the element?
Mass number = protons + neutrons. … therefore 16 neutrons. It is silicon.
How do you form an anion?
Add an electron
How do you form a cation
Remove an electron
The ion with a +1 charge, atomic number 55 and mass number 33
133(super)Cs+
