History of the Atom
Atom and its Parts
Isotopes
Isotope Problems
Misc Problems
100
Who proposed the idea that matter is composed of indivisible particles known as atoms?
John Dalton
100
What are the three main subatomic particles of an atom?
Protons, neutrons, and electrons
100
What are isotopes?
Atoms of the same element with different numbers of neutrons.
100
If an element has 6 protons and 8 neutrons, what is its mass number?
14
100
What is the charge of an ion that has 10 protons and 8 electrons?
+2 (it is a cation)
200
What model of the atom did J.J. Thomson create after discovering the electron?
Plum pudding model
200
Where are protons and neutrons located in an atom?
In the nucleus
200
The atomic number lets us know what about an element?
The number of protons in an element
200
If an atom has 6 protons and 7 neutrons, what is its isotope notation?
Carbon-13 (written as 13C)
200
How do you determine the charge of an ion?
By comparing the number of protons to electrons.
300
What was Ernest Rutherford's major finding in his gold foil experiment?The nucleus is small and dense, and most of the atom is empty space.
The nucleus is small and dense, and most of the atom is empty space.
300
What is the charge of an electron?
Negative charge
300
To solve for mass number you need to?
Add the protons and neutrons
300
Calculate the number of neutrons in an isotope of sodium with a mass number of 23.
12 neutrons (23 - 11 protons)
300
If an atom gains an electron, what type of ion does it become?
An anion
400
Which scientist is known for the planetary model of the atom?
Niels Bohr
400
What determines the atomic number of an element?
The number of protons in the nucleus
400
To solve for charge you need to?
Subtract protons from electrons
400
If an isotope of chlorine has 18 neutrons, what is its mass number?
35 (since chlorine has 17 protons, 17+18=3517+18=35)
400
What do you call an atom with a different number of protons and electrons?
An ion
500
What theory did Schrödinger contribute to the understanding of atomic structure?
Quantum mechanical model of the atom
500
How do you find the mass number of an atom?
By adding the number of protons and neutrons
500
How does the presence of isotopes affect the average atomic mass of an element?
It is a weighted average based on the relative abundance of each isotope.
500
What is the Isotopic Notation for this bohr model?
2412Mg
500
What is the bohr model for Boron?
