Subatomic Particles
Atomic Model History
Identifying the Atom
Most Common Isotopes
Average Atomic Mass
100
The subatomic particle that is found inside the nucleus and has a positive charge
Proton
100
Which atomic model accrately described the atom as having mostly empty space?
Rutherford
100
Which subatomic particle identifies the atom?
Proton
100
According to the periodic table what is the most common isotope of carbon?
Carbon-12
100
Where do you find the average atomic mass for each element on the periodic table?
At the bottom of the square
200
The subatomic particle that has a neutral charge and is found in the nucleus
Neutron
200
What is the main difference between the modern atomic model an the Bohr model?
Modern show electron in "clouds."
200
Can two elements be the same if it has a different number of neutrons?
Yes. Only the protons need to be the same
200
According to this image, what is the most common isotope of Sulfur?
Sulfur-32
200
What is the definition of average atomic mass?
The weighted average of all the isotopes of an element.
300
The subatomic particle that has a negative charge and is found in orbitals outside the neucleus.
Electron
300
Which is a merit of the Thomson model?
a. introduction of the neutron
b. the electrons are located in a "cloud"
c. it shows an atom that is neutral
C
300
Atom A has 5 protons. What is the name of that element?
Boron
300
An atom has 26 protons and a mass number of 56. How many neutrons does it have?
30
300
What is a weighted average based on?
Abundance
400
The two atomic particles that have a mass of 1 AMU
Protons and Neutrons
400
What is the primary limitation of Thomson's model the was later exposed by Rutherford?
Thomson said the positive and negative charges were spread throughout the atom
400
One atom has 3 protons and 3 neutrons. Another atom has 3 protons and 4 neutrons. Do these atoms represent the same element?
Yes
400
According to this image, what is the most common isotope of Bromine?
Bromine-79
400
An element has istotopes with the following masses
X-28
X-29
X-30
Could the most common isotope of this element be X-50? Why or why not?
No because the average would need to be a number close to 28, 29, and 30
500
An atom has 3 protons and 4 neutrons, what is its mass number?
7
500
Which is a limitation for the Rutherford model?
A. Could not explain why electrons didn't spiral int the nucleus
B. Failed to account for protons mass
C. Overestimated the charge of the nucleus
D. Could not determine the exact speed of electrons
A.
500
Atom 1 has 4 protons, 3 neutrons and 4 electrons
Atom 2 has 4 protons, 4 neutrons and 4 electrons
Atoms 3 has 3 protons, 4 neutrons and 3 electrons
Which 2 atoms represent the same element?
1 and 2
500
An element has a most common isotope with a mass number of 24. What element is it?
Magnesium
500
What are the 3 steps to finding average atomic mass when given the mass and the percent abundance?
1. Change the percent abundance to a decimal by dividing by 100.
2. Multiply the mass by the decimal number
3. Add the answers to #2 together