Atomic Numbers
The number that represents the number of protons in the nucleus of an element.
What is the atomic number?
Electrons move around the nucleus at this speed
What is the speed of light?
This phase change is going from a liquid to a solid state of matter
What is freezing?
Democritus and other ancient thinkers had a 4 member periodic table, name 3 of the 4 (at least)
What are earth, wind, fire, and water?
In chemistry the math relies on the fact that matter is not created or destroyed, an explanation of this law.
What is the Law of the Conservation of Mass?
This number represents the total relative mass of both protons and neutrons in the nucleus.
What is the mass number?
In a neutral atom electrons are equal to this other sub atomic particle.
What is a proton?
This phase change is the transition from liquid to gas at a specific temperature.
What is boiling?
John Dalton started getting ideas about how atoms are paired by testing these.
What are gases or chemical reactions?
If 2 grams of an element (X) combine with 4 grams of element (Y) to for a compound (XY), how much of the compound must I have? (hint: Law of conservation of mass)
What is 6 grams of compound XY?
In order to solve for the number of these you subtract the atomic number from the mass number
What is the number of neutrons?
The exact location of an electron cannot be known, but it can be guessed or approximaed using this.
What is probability?
The name of this phase change of matter from solid to gas also has the meaning of an experience which is enjoyable beyond compare.
What is to sublime/ sublimation?
John Dalton thought that all elements were always exactly the same, because these (sometimes radioactive versions of atoms) had not been discovered yet.
What are isotopes?
If an atom has a mass number of 35 what must be true about the number of protons and neutrons in the nucleus of that atom?
That is the number of protons and neutrons cannot be equal?
When writing elements in nuclear format this number is on the bottom in subscript (opposite of superscript ex: x2)
What is the atomic number?
In J.J. Thompson's gas experiment what were the electrons in the beam of neon gas attracted to?
What is a postively charged (metal) plate?
This transition of matter is from liquid to gas at room temperature.
What is evaporation?
In the ancient world a person's theory would be tested based on this, not upon experimentation.
What is rhetoric or an argument?
What is the mass number/ number of neutrons?
If an atom has a positive charge you will need to change the number of these particles in which way (add or subtract)
What is subtract that number of electrons?
The relative mass of an electron to a proton or neutron (hint: it is a ratio)
What is 1/1840 or 1/1860?
This transition of matter is from gas directly to a solid, and can also be a word for giving a sworn legal statement in the proceedings of a court case.
What is deposition?
Rutherford was able to prove that most of the atom was in a very small area known as the nucleus by shooting alpha particles at this expensive laminate.
If something changes state and you collect all the atoms that you started with this did not change.
What is the mass?