Nothing on your desk except a pen. Everything else goes on the floor! No visible periodic tables Penmanship is very important! After the quiz, go weigh your gum.
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Element Quiz Time!Nothing on your desk except a pen.Everything else goes on the floor!
No visible periodic tablesPenmanship is very important!
After the quiz, go weigh your gum.
Warmup (5 minutes)*let me know if you didn’t receive a periodic table*see if you can attack the following questions already!!!! I will reveal the answers at the end of lecture
1) How many protons are there in 1 atom of sulfur?
2) Which if the following elements below has 24 protons?
A. bismuthB. chromiumC. cadmiumD. All of these
3) How many neutrons are there in most boron atoms?
4) The atomic mass of an atom is mostly due to the mass of its:
A. protons onlyB. neutrons onlyC. protons and neutronsD. protons and electronsE. none of the above
You can chew gum in class today! Weight it first.
Analogy Football Field
Outer Edge of AtomNucleus
The nucleus of the atom is TINY relative to the total volume of the
atom, yet contains most of the mass!!!!!!
99.9% of the VOLUME of the atom is taken up by e- orbiting the empty space around the nucleus, while only 0.1% of volume is the nucleus99.9% of the MASS of an atom is densely packed in the tiny nucleus, while the other 0.1% of the mass is from the mass of the electrons
Subatomic Particle
Mass Electric Charge
Location Effect of Adding or
Removing Particle
PROTON
(p or +)
ELECTRON
(e-)
NEUTRON
(0 or n)
Subatomic Particle Details
Subatomic Particle
Mass Electric Charge
Location Effect of Adding or
Removing Particle
PROTON
(p or +)
1 amu or
g/mole
ELECTRON
(e-)Zero;
1/2000 p & n
NEUTRON
(0 or n)
1 amu or
g/mole
Subatomic Particle Details
1 proton is actually 0.00000000000000000000000167 grams!1 amu = 1.67 x 10-24 grams
Subatomic Particle
Mass Electric Charge
Location Effect of Adding or
Removing Particle
PROTON
(p or +)
1 amu or
g/mole
+1
ELECTRON
(e-)Zero;
1/2000 p & n
-1
NEUTRON
(0 or n)
1 amu or
g/mole
0
Subatomic Particle Details
Subatomic Particle
Mass Electric Charge
Location Effect of Adding or
Removing Particle
PROTON
(p or +)
1 amu or
g/mole
+1 nucleus
ELECTRON
(e-)Zero;
1/2000 p & n
-1 in cloud around nucleus
NEUTRON
(0 or n)
1 amu or
g/mole
0 nucleus
Subatomic Particle Details
Subatomic Particle
Mass Electric Charge
Location Effect of Adding or
Removing Particle
PROTON
(p or +)
1 amu or
g/mole
+1 nucleus new element with new properties
ELECTRON
(e-)Zero;
1/2000 p & n
-1 in cloud around nucleus
same element, but becomes an ion
NEUTRON
(0 or n)
1 amu or
g/mole
0 nucleus same element, different mass and
stability
Subatomic Particle Details
The PT shows the recipe for atoms of every element
11 electrons
+
+
+ +
++
++
++
+
11 protons
o
oo
o
ooo
o oo
oo
12 neutrons
Atomic #
Average Atomic
Mass
11
NaSodium
22.99
(orbiting nucleus)
Atoms have a neutral charge when the # of protons (+) = # of electrons (-)
# protons = atomic # = element identity
protons + neutrons = mass number
What happens if we:1. Add 2 protons to O?
- light for signs, nothing to breathe2. Add 2 neutrons to O?
- increase mass, less stable, radioactive
- new isotope of oxygen3. Add 2 electrons to O?
- ion with -2 charge
8O
Oxygen16.00
10Ne
Neon20.18
Changing the
contents of an atom
PracticeElement
Symbol
Atomic Number
Mass Number
# of Protons
# of Neutrons
# of Electrons
106 60 4646Pdpalladium 46
What elements are these?
These are all ISOTOPES: the same element (same # protons) but they are just
different versions of that element (different number of neutrons).
HYDROGEN-1 HYDROGEN-2 HYDROGEN-3
isotope notation:
Element Name Mass Number
Atomic # # p & n # of protons
# of electrons
H3
OMass number
Atomic number
8
Ion charge(+ or -), leave BLANK if there is no charge
-217
Nothing goes here….yet!
How to write and decode an element symbol….
1) How many protons are there in 1 atom of sulfur?
2) Which if the following elements below has 24 protons?
A. bismuthB. chromiumC. cadmiumD. All of these
3) How many neutrons are there in most boron atoms?
4) The atomic mass of an atom is mostly due to the mass of its:
A. protons onlyB. neutrons onlyC. protons and neutronsD. protons and electronsE. none of the above
16 6
Before you touch the SISS samples, take the gum out of your mouth and leave it to dry in the back. Weigh it another day.
Finish SISS measurements and throw samples away.
Go over Dead White Guys.
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