Download presentation
Presentation is loading. Please wait.
Published byRhoda Williamson Modified over 6 years ago
1
Rounding Summary Fill in zeros where you have estimated Round to tens:
Whole numbers Decimal Numbers Fill in zeros where you have estimated Round to tens: 756.09 760. Drop all numbers that you have estimated Round to tenths: 756.09 756.1
2
Rounding Practice Quiz- Quiz- Trade
You each get a card. When you are not paired up your hand is up. Move around and pair up. You will answer each question Trade Cards.
3
What’s in that beam? J.J. Thomson, 1897
Cathode Ray Tube Experiments to measure the charge to mass ratio of the beam. Particles in beam travel farther than hydrogen atoms. The particles are 1000 times smaller than hydrogen atoms.
4
Thomson’s Model of the Atom 1897
Uniform base of positive charge with negative charges mixed within (electrons)
5
Ernest Rutherford, 1911 Gold Foil Experiment
6
What’s the pudding? 1911 Ernest Rutherford’s Gold Foil Experiment
Determined that the atom is mostly empty space Nucleus is a tiny, dense positive region Contains all of an atom’s mass Later concluded that nucleus contains positive units (protons)
7
James Chadwick, 1932 After being released as a prisoner of WWI, Chadwick focused on radioactivity Noticed discrepancies in the proton number and mass number Used radioactive experiments to determine the neutral atom that has the mass of a proton (neutron)
8
Find Someone Who… You will ask someone if they know the definition of the words in the left column You will write their definition down You will write their name Once your done come back inside and glue on top half of pg 12
9
Atom Boards Open up your boards Let’s make a key Red= Protons
Blue= Electrons Clear= Neutrons
10
Build me an atom of Oxygen
How many proton’s did you put in? How many electrons did you put in? How many neutrons did you put in? Atomic number= number of protons- determines element identity Mass number= protons + neutrons
11
Isotopes-atoms of one element that have different mass number
Isotopes change the number of ________ Build me an oxygen-18 atom What does 18 represent? Hyphen notation: element name – mass #
12
Mass # Practice Element Symbol Atomic # Mass # # of Protons
# of Neutrons #of Electrons Oxygen-16 16 Ru 58 26 56 23
13
Think it through On the left page bottom half page
15
Ions- particles that carry a charge
Adding electrons creates an ANION- negatively charged atom Removing electrons creates a CATION- positively charged atom
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.