Atomic Theory
Atomic Math
Average Atomic Mass
Subatomic Particles
Origin of Elements
100

Who coined the term “atomos”? What does it mean?

Democritis; Uncuttable
100

The atomic number is the same as the number of ____ in an atom

protons

100

What two components do you need to find the average atomic mass of an element?

mass number and percent abundance

100

Which subatomic particle has a negative charge?

electron

100

Where are many of the elements created?

stars

200

What did J.J. Thomson’s model of the atom look like?

Plum Pudding

200

How do you find the number of neutrons in a given isotope?

mass number - number of protons

200

Carbon has 3 naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. If the average atomic mass of carbon is 12.011 amu, which isotope is the most abundant? How do you know?

Carbon 12. 12.011 is closest to 12, so the majority of carbon atoms are a carbon-12 isotope.

200

Where are each of the subatomic particles located?

protons and neutrons- nucleus

electrons- electron cloud

200

Through what process are elements created?

fusion

300

What was the problem with Bohr's model? How did Schrodinger fix it? 

Bohr had fixed energy levels and electron placements; Schrodinger discovered the electron cloud

300

Define isotope

atoms with the same number of protons but a different number of neutrons

300

How is average atomic mass different from mass number?

average atomic mass: the average of the mass numbers for all isotopes of that element.

mass number: the mass (protons + neutrons) of that specific isotope

300

How many protons does Br have?

35

300

What is the heaviest element forged in a star's core?

iron

400

Name two conclusions of Rutherford's Gold Foil experiment

Small dense nucleus, positively charged nucleus, atom is mostly empty space

400

How many neutrons does Cadmium-113 have?

65

400

Write out the two common ways to express a carbon isotope that has a mass number of 13.

136

Carbon-13

400

What subatomic particle(s) make up the majority of an atom's mass?

protons and neutrons

400

What can you infer about the age of a star if there is iron present?

it is near the end of its life

500

List the scientists who contributed to atomic theory in chronological order

Democritus, Dalton, Thompson, Rutherford, Bohr, Schrodinger

500

What is the mass number of a stable isotope with 82 electrons, 82 protons, and 126 neutrons?

208

500

Strontium consists of four isotopes with masses of 84 (abundance 0.50%), 86 (abundance of 9.9%), 87 (abundance of 7.0%), and 88 (abundance of 82.6%). Calculate the atomic mass of strontium.

87.712u

500

What is the atomic number for Rb? How many electrons does it have?

37, 37

500

What causes a star to become a supernova?

the core collapses because it runs out of fuel

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