Exam (elaborations)
Unit Test- Atomic Structure - History and Structure of the Atom Questions and Answers Latest Updated
- Course
- Institution
Unit Test- Atomic Structure - History and Structure of the Atom
[Show more]
Content preview
Unit Test- Atomic Structure - History andStructure of the Atom
When was the idea of an atom first developed? - answer John Dalton, 1803.
State the 4 major ideas of Dalton's Atomic Theory - answer1. Matter is made up with
atoms that are invisible and indestructible
2. All atoms of an element are identical
3. Atoms of different elements have different weights and different chemical properties.
4. Atoms of different elements combine in simple whole numbers to form compounds.
Describe the experiment that led to the discover of the electron. Who discovered it? -
answer Experimented with Crookes, cathode ray, and a tube. The experiment showed
that cathode rays were negatively charged. Joseph John "J.J." Thomson in 1897.
Describe Rutherford's gold foil experiment. What did this experiment tell us about the
structure of the atom? - answer Rutherford shot a beam of alpha particles at a sheet of
gold foil. He concluded that a tiny, dense nucleus was causing the deflections.
What are the 3 subatomic Particles? - answerProton, Neutron, and Electron.
Who discovered the Neutron. - answerJames Chadwick
Who determined the charge of the electron and during what experiment. - answerRobert
A. Millikan during the Oil Drop Experiment.
Describe the Electron Cloud Model of the Atom. What are the smallest parts of an atom
we know today? - answerThe electron cloud model includes an electron cloud around
the nucleus which contains neutrons and protons.
1. electrons
2. protons
3. neutrons
What does the atomic number of an element represent? What does the mass number of
an atom represent? - answerThe atomic # represents the distinct identity of an element
and number of protons
The mass # represents the sum of protons and neutrons
What are isotopes? How are they similar to each other? How are they different? -
answerIsotopes are always, with the same number of protons but different number of
neutrons.
- they have the same number of protons
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller julianah420. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67096 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now