Atomic Theory
Who discovered the electron ?
J.J. Thomson discovered the electron in 1897
what is happens in a sublimation
a transition where a substance changes directly from a solid to a gaseous state.
Uranium
These two subatomic particles are found in the nucleus of an atom, but only one of them has an electric charge.
protons and neutrons
what is the density of water ?
1.0g/mL
what is the name of the first model of an atom ever created ?
Solid sphere model
what are the three states of KMT
Solid, Liquid, Gas
What element is this #71
Lutetium
its much smaller than other subatomic particles, these negatively charged particles are responsible for chemical bonding and reactions.
electrons
Mass is the amount of matter in an object, while weight is the force of gravity acting on that mass.
What experiment did Ernest Rutherford do ?
Gold foil experiment
what is called the process that makes liquid turn into gas ?
Evaporation
Iridium
the neutrons and protons stay in the nucleus where does the electrons stay ?
Electron Cloud or Shells
what measurement is used for volume ?
Cubic Units
EXAMPLES: (cm³) (m³) (in³)
This subatomic particle was discovered by J.J. Thomson using a cathode ray tube and has a negative charge.
According to the Kinetic Molecular Theory, what happens to the particles of a gas when the temperature increases ?
When the temperature increases, the particles of a gas move faster because they have more kinetic energy.
How do you find the neutron ?
Neutron= Mass Number−Atomic Number
Which subatomic particle orbits the nucleus and has a negative charge?
electrons
A tank contains 5.0 liters of water at 20°C. If the density of water at this temperature is 0.998 g/mL
mass of the water is 4990 grams
This scientist developed the model of the atom where electrons orbit the nucleus in energy levels.
Niels Bohr
what is the format of a solid?
a tightly packed, ordered arrangement of particles
The elements in Group 18 of the periodic table, also known as the noble gases, are very unreactive and are often used in neon signs and balloons.
noble gases
Which force is responsible for holding protons and neutrons together in the nucleus ?
The strong nuclear force
What's the difference between mass and weight ?
Mass is the amount of matter in an object and Weight is the force of gravity on an object.