Atomic Theory
This philosopher first developed the theory of the atom.
Who is Democritus?
These sub particles are located in the nucleus.
What are protons and neutrons?
These are atoms with the same number of protons, but different number of neutrons.
This is an arrangement of elements according to similarities in their properties.
What is the periodic table?
This is 1/12 the mass of a Carbon 12 atom.
What is atomic mass unit?
List 2 parts of Dalton's atomic theory.
All elements are composed of atoms.
Atoms of the same element are similar.
Atoms of one element are never changed to atoms of another element.
Chemical reactions occur when atoms of elements are combined, separated, or rearranged.
A neutral element has equal numbers of these.
What are protons and electrons?
Three isotopes of Carbon are present, find the atomic mass of Carbon
Carbon-12 (27.2%) atomic mass - 12
Carbon- 13 (34.3%) atomic mass - 13.003
Carbon - 14 (38.5%) atomic mass - 14.003
13.11
This is the horizontal row of the periodic table.
What is the period?
What is the mass number?
This scientist discovered the electron.
Who is J.J. Thomson?
This is equal to the sum of the number of protons and the number of neutrons in an atom.
What is the mass number?
Three isotopes of Oxygen exist, calculate the atomic mass
Oxygen-16 (17.5%) atomic mass - 15.9949
Oxygen-17 (32.3%) atomic mass - 16.9991
Oxygen-18 (50.2%) atomic mass - 17.9992
17.33
This is the vertical column on the periodic table?
What is group or family?
This is the glowing beam that travels from the cathode to the anode.
What is the cathode ray?
This scientist developed the Plum Pudding Model, where the nucleus was a positively charged area in the atom.
Who is J.J. Thomson?
State a relationship between the masses of a proton, a neutron and an electron.
The mass of a proton and neutron are roughly equal, while the mass of an electron is roughly 1/1840 the mass of a proton.
List the number of each subatomic particle in an atom of a neutral element with the atomic number 9, and a mass number of 19.
Protons: 9
Electrons: 9
Neutrons: 10
This is displayed on the periodic table, and represents the number of protons in an atom of an element.
What is atomic number?
This is the unit of measure for atomic masses.
What is an amu?
This experiment helped to discover that the atom was mostly empty space, with a dense core that also has a positive charge.
What is gold film experiment?
Briefly describe the structure of the atom.
What is the nucleus (majority of mass, contains the protons and neutrons) and relatively empty space around the nucleus (electrons).
Briefly describe the differences between neutral atoms of Nitrogen-14 and Nitrogen-15.
Both isotopes have 7 protons, both have 7 electrons and Nitrogen 14 has 7 neutrons while Nitrogen 15 has 8 neutrons.
How is the atomic mass that is displayed on the periodic table determined
What is the weighted average of all naturally occurring isotopes of the element?
This is the best way to identify an element.
What is the number of protons in an atom of the element?