wake-up a.refer to element below. name the element. b.how many protons, neutrons, and electrons?...
DESCRIPTION
Electrons are important… Because they feel each other first when atoms meet. Outer electrons of atoms interact with other electrons first!TRANSCRIPT
Wake-up
a. Refer to element below. Name the element.b. How many protons, neutrons, and
electrons?c. Naturally occurring Europium consists of
two isotopes with a mass of 160 and 161. If Eu-160 has abundance 49% and Eu-161 has 145%. What is the average atomic mass of Eu?
Electron Configuration … Where are electrons found?
Electrons are important…Because they feel each other first when atoms meet
.
Outer electrons of atoms interact with other electrons first!
Neils Bohr: 1913• Electrons move in orbitals around nucleus• AKA Planetary Model• Each orbital holds a certain number of electrons
with increasing energy
Electron Energy Levels1st Energy Level (surrounding the nucleus) contains
2 electrons
2 electrons
Electron Energy Levels2nd Energy Level (surrounding the nucleus)
contains 8 electrons
8 electrons
Electron Energy Levels3rd Energy Level (surrounding the nucleus)
contains 18 electrons• BUT if not enough to fill 18 and enough to fill 8,
fill 8 and move to next energy level.
18 electrons (8e-)
Electron Energy Levels4th Energy Level (surrounding the nucleus)
contains 32 electrons
32 electrons
How to Complete a Bohr Ring ModelFind the number of electrons; start filling the
energy levels starting with the 1st and working way out
Example #1: SodiumHow many electrons does Sodium have?
11
Potassium
Hydrogen
Carbon
Neon
Calcium