Week 2 Lecture: Atoms And Their Electrons Flashcards
What is the energy level of electrons?
Every electron has a specific amount of energy.
What is how electrons arrange in the electron cloud called?
Electron arrangement of atoms.
What are shells?
Electrons of similar energy in an energy level called a shell.
What shells contain the lowest energy?
The shells closest to the nucleus contain electrons with lowest energy.
How many shells are there?
7
What is the maximum number of electrons in electron shell 1?
2
What is the maximum number of electrons in electron shell 2?
8
What is the maximum number of electrons in electron shell 3?
18
What is the maximum number of electrons in electron shell 4?
32
What is the specific order for filling electrons of the first 20 elements?
Fill 2 into shell 1, fill 8 into shell 2, fill 8 into shell 3, fill 2 into shell 4.
What are valence electrons?
The electrons in the outer shell have an important role in determining the chemical properties of an atom.
What are electron dot diagrams?
This is a shorthand system for designating the number of valence electrons.
What does an electron dot symbol consist of?
They consist of an element’s symbol with one for each valence symbol placed around the elemental symbol.
How does atomic size increase?
It increases down the periodic table in each group due to the increasing number of electron shells.
How does atomic size decrease?
Decreases from left to right across each period (row) in the periodic table due to the increasing number of protons pulling the electrons closer to the nucleus.
