Scientists
Proposed the first atomic theory stating all elements are composed of atoms
Who is John Dalton?
Protons, neutrons, and electrons
What are subatomic particles?
The number 14 in carbon-14
What is the mass number?
Negatively charged atoms
What are anions?
Mass read off the periodic table
What is atomic mass?
Discovered the electron using the cathode ray tube experiment
Who is J.J. Thomson?
If a neutral atom has 19 protons and 20 neutrons, this is the element and its mass number
What is potassium-39?
Is always equal to the number of protons
What is the atomic number?
What are nonmetals?
Most abundant isotope of Sulfur (S); isotopes: S-32, S-33, S-34
What is S-32?
Who is Democritus?
Places where electrons are located
What are energy levels?
An atom that has 35 protons
What is bromine (Br)?
H-1, H-2, H-3
What are isotopes?
Atomic mass of antimony (Sb)
What is 121.76?
Discovered that the atom is mostly empty space & a small positive nucleus
Who is Ernest Rutherford?
Positively charged and high density
What is the nucleus?
6429?
What is copper (Cu)?
Charge of an atom with 8 protons and 10 electrons
What is -2?
To calculate average atomic mass, you multiply the mass of each isotope by its relative abundance, expressed as this type of number
What is a decimal?
Discovered the proton
Who is Goldstein?
Has a charge of -1 and a mass of 1/1840
What is an electron?
What is number of neutrons?
Charge of an atom with 82 protons and 78 electrons
What is +4?
The atomic mass of an element is a weighted average of these two properties of its naturally occurring isotopes?
What are mass number and percent abundance?