Subatomic Particles
This subatomic particle has a negative charge and orbits the nucleus.
What is the electron?
This Greek Philosopher who pondered the existence of the atomos, which was the smallest substance of matter that was indivisible.
Who is Democritus?
What we know about atoms has been discovered by studying them (directly or indirectly) because they are too small to see? Rutherford's fold foil experiment is a good example of this.
What is indirectly?
In an atom, the number of protons equals the number of ___________.
What is electrons?
The top number on each block in the periodic table represents this.
What is atomic number?
The smallest of the subatomic particles is ____________.
What is the electron?
The Greek Philosopher rejected the ideas of Democritus.
Who is Aristotle?
Neils Bohr hypothesized that electrons had certain amounts of energy that determined their distance from the ____________.
What is the nucleus?
The area of the atom with the greatest mass.
What is the nucleus?
As one goes across and down the periodic table, reactivity _________________.
What is decreases as you go across and increases as you go down?
These particles are positively charged and reside in the nucleus of the atom.
What are protons?
He developed the first atomic theory and most of it is believed to be true today.
Who is John Dalton?
The electron cloud model is also called the ____________ __________ model.
What is Quantum Mechanics?
An atom of an element with the same number of protons but different number of neutrons.
What is an isotope?
The group of elements that is most reactive.
What is the alkali metal group or Group 1a?
The subatomic particle does not have a large effect on the atom's properties even though it is the most massive subatomic particle in the atom.
What are neutrons?
With math, Schrodinger was able to show that electrons will stay in their patterned dance until they gain energy and speed up or lose energy and _______ _________.
What is slow down?
When the alpha particles in Rutherford's gold foil experiment, deflected significantly, it mean the particles had encountered the __________.
What is the nucleus or protons?
This is the region of space around the nucleus where electrons are most likely to be found.
What is an electron shell or energy level?
The number of protons plus the number of neutrons is referred to as the ________ ____________.
What is Mass number?
Electrons that are in the highest energy level of an atom.
What valence electrons?
Dalton's atomic theory was based on two laws. The name of this law states that matter cannot be created or destroyed but can change forms.
What is the Law of Conservation of Mass?
The name given to Rutherford's model of the atom.
What is the planetary model?
Carbon has an atomic number of 6. The number of neutrons in Carbon-14.
What is 8 neutrons?
He placed elements across the rows by increasing mass arranging them in a logical order that revealed patterns.
Who is Mendeleev?