Atomic Structure
This subatomic particle has a negative charge.
What is an electron?
The law that states matter cannot be created or destroyed
This experiment showed that atoms contain negatively charged particles.
What is the cathode ray tube experiment?
a form of energy that exhibits wavelike behavior as it travels through space
What is electromagnetic radiation?
The lowest energy state of an atom.
What is the ground state?
All atoms of the same element have the same number of this subatomic particle.
What is a proton?
States that chemical compounds are formed from elements in simple whole-number ratios.
What is the law of multiple proportions?
In 1909, experiments conducted by the American physicist Robert A. Millikan measured the charge of the electron and also showed it had a very small ______.
What is mass?
This is all the forms of electromagnetic radiation in order of wavelength.
What is the electromagnetic spectrum?
The packet of energy release from an electron that moves from a higher energy state to a lower energy state.
What is a photon?
What is the mass number?
A chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound.
The law of definite proportions.
The experiment that showed that each atom in the contains a small, dense, positively charged nucleus surrounded by electrons.
What is the Rutherford gold foil experiment?
The distance between corresponding points on adjacent waves.
What is the wavelength?
This hypothesis predicted that this type of emission pattern would be produced by hydrogen atoms that are excited by whatever amount of energy was added to them.
What is the continuous spectrum?
The number of atoms or molecules in one mole of a substance.
Avogadro's number (6.02x1023)
He was an English school teacher that combined the different atomic laws into the first atomic theory.
Who was John Dalton?
The patter of light that is emitted from a tube filled with the gas of one element and energized with electricity.
What is the line-emission spectrum?
The number of waves that pass a given point in a specific time, usually one second.
What is the frequency?
The speed of light is equal to the _________ x _________.
What is the wavelength x the frequency?
The mass of a substance that is equal to one mole.
What is the molar mass?
These five points make up the first atomic theory proposed by an English school teacher in 1808.
1. All matter is composed of extremely small particles called atoms.
2. Atoms of an element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
3. Atoms cannot be subdivided, created, or destroyed.
4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
5. In chemical reactions, atoms are combined, separated, or rearranged.
The experiment that showed that electrons from some metals can be excited to the point that they leave the metal when a light in shined on them.
What is the photoelectric effect?
The minimum quantity of energy that can be lost or gained by an atom
What is a quantum?
This was the first model of the atom to propose that the electrons orbited the nucleus in specific energy levels.
What is the Bohr model of the atom?