Atomic Scientists
Subatomic Particles
Atomic Structure
The Periodic Table
Isotopes
100

Who discovered the electron using the cathode ray tube experiment?

J.J. Thomson

100

What is the charge of a proton?

Positive

100

How is the mass number of an atom found?

Add the protons and neutrons. (Total number of protons and neutrons in the nucleus)

100

What are the vertical columns in the periodic table called?

What are the horizontal rows in the periodic table called?

Groups

Periods

100

What is an isotope?

Atoms of the same element with different numbers of neutrons

200

Who proposed that electrons move in fixed energy levels around the nucleus? 

AND

Which scientist discovered the neutron?

Niels Bohr

James Chadwick

200

Where are neutrons found in an atom?

In the nucleus

200

What does the atomic number of an element represent?

The number of protons in the nucleus

200

What does a group tell us about an atom?

What does a period tell us?

Number of valence electrons

Number of energy levels

200

How many neutrons are in chlorine-35?

18 neutrons

300

Name Ernest Rutherford's three main conclusions from his Gold Foil Experiment. 

Positive Protons

Protons live in nucleus

Atom is mostly empty space

300

Which subatomic particle has the least mass?

Electron

300

How many neutrons are in an atom of carbon-14?

8

300

Which element has 3 valence electrons in the 4th energy level?

Gallium

300

Are carbon-12 and carbon-14 isotopes of each other? Why or why not?

Yes, because they have the same number of protons but different numbers of neutrons

400

Name the 4 main parts of John Dalton's Atomic Theory.

1.  Atoms are indivisible

2. Atoms of the same element are identical

3. Atoms can combine to form compounds

4. When atoms combine they combine in whole number ratios by mass (Law of Constant Proportions)


400

How many protons does a nitrogen atom (atomic number 7) have? How many electrons?

7 and 7

400

What is the charge of the nucleus of an atom?

Positive, because it contains protons and neutrons

400

Name an element that will behave similarly to Sulfur. 

Answers will vary. Any group 16 element. 

400

Why are the masses on the periodic table decimals if we can only have whole numbers of protons and neutrons?

The masses on the periodic table are weighted averages of all the isotopes of that atom. 

500

Choose either Thomson's or Rutherford's experiment and describe it in detail. Include what they did AND what they found. 

Answers will vary. 

500

How many protons, neutrons, and electrons in a sodium atom with a mass number of 23 and an atomic number of 11?

11 protons, 12 neutrons, and 11 electrons 11 protons, 12 neutrons, and 11 electrons

500

Why are atoms neutral overall?

Because they have equal numbers of protons and electrons

500

Which element has 2 filled energy levels and 2 valence electrons?

Beryllium

500

Are any of the atoms in this table isotopes of each other? Explain.

Atom      Protons       Neutrons          Electrons 

              8                        10                     8

             10                       9                      10 

             9                         9                       9

      4              8                         8                        8         

1 and 4. Same element (same # of protons) but different masses. 

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