Atomic Theorists
Who discovered the atom?
John Dalton discovered the atom
What is the amount electrons that can be in one shell?
2 electrons
Who discovered the Periodic table?
Dmitri Mendeleev who arranged the elements by atomic mass.
What is the word for when something is turning from liquid to solid?
Solidification is the word used for when something is turning from liquid to solid
What are the 3 phases of matter?
The 3 phases of matter are: solid, liquid, and gas
Who proposed the planatery model of the atom?
Ernest Rutherford proposed the planatery model of the atom
In Bohr models what happens when an electron absorbs energy?
The electrons move faster because they abrosb the energy and go in a thing called 'excited state'
Why did Dmitri Mendeleev leave gaps in his Periodic table?
Because he predicted the existence of elements that hadn't been discovered back then and left space so they could be based on their expected properties.
What does the KMT (Kinetic molecular theory) explain?
KMT explains the behavior of the gases based on the idea that are made of tiny particles in constant motion
Can you see steam or water vapour?
Steam is the correct answer
Who discovered that atoms have mostly empty space?
Ernest Rutherfurd discovered that atoms have mostly empty space
How does the Bohr model explain the light that comes from the atom?
When electrons fall from a higher energy level to a lower one then they release this light
What do the horizontal rows of the Periodic table represent?
Periods because the elements with the same period have the same number of electron shells.
What does the KMT (Kinetic molecular theory) explain? about the space between gas particles?
KMT states that gas particles are far apart compared to their size.
How does a refrigerator cool foods and drinks?
By removing energy from the food causing it to slow down due to the temperature level
Which atomic theorist is known for developing a wave of equations that described the behavior of electrons in an atom?
Erwin Schrödinger described the behavior of electrons in an atom
How did the Bohr model improve after Rutherford's model?
The Bohr models now have a specific orbit for electrons for more stability of the atom
What do the vertical rows of the Periodic table represent?
Groups or families of elements in the same group have similar chemical properties.
What does the KMT explain about the pressure exerted by gas?
Pressure is caused by gas particles colliding with the walls of their container
What is needed to change the phase of matter?
The change would be to add or subtract/removing energy
Which atomic theorist model was described as the 'Plum pudding model'?
JJ Thomson was the inventor of the 'Plum pudding model'
Which element did Niels Bohr use to develop the electron orbit?
Hydrogen the first element on the periodic table that Niels used
Who reorganized the Periodic table by atomic number?
Henry Moseley he established that the elements should be arranged by atomic number and not atomic mass
According to the KMT why do gases expand to fill their space/container?
Gases expand to fill their space/container because the particles are in constant movement and will do random motion and will spread out to occupy the space that's left.
What is absolute zero?
Absolute zero means when the molecules have zero movement (-273°)