Ancient Models
Although there are many illustrations and models, scientists actually have not seen it.
What is an atom?
Dalton's atom theory follows the idea that all matter is made of particles called this.
What are atoms?
Rutherford suggested that there must be a tiny but concentrated positively charged mass in the center of the atom.
What is the nucleus?
A pure substance that cannot be broken down into a simpler substance and contains only one type of atom.
What is an element?
A branch of the natural sciences, and it deals with the study of nonliving things.
What is physical science?
Mendeleev created a table that arranges the elements in columns with properties that repeat from row to row.
What is the periodic table?
Dalton's atomic theory has a big idea that two or more atoms from different elements can join together to form _________ in chemical reactions.
What are compounds?
These are a positive charge and located in the nuclues.
What are protons?
What is a molecule?
An investigation in which the factors that influence the outcome are kept the same except for one - the factor being studied.
After Rutherford discovered protons, atomic mass number and more elements were added to an organizational table. The rows are called periods and the columns are called groups.
What is the periodic table of elements?
Dalton's atomic theory is based on two laws. The first law states that matter cannot be created nor destroyed, but changes from one form into another.
What is the law of conservation of matter?
These have a neutral charge and located in the nuclues.
What are neutrons?
Ash forms on burning wood. - This is because oxygen in the air combines with the carbon and hydrogen in the wood. Once all the wood has burned, all that will be left are new substances. This type of property is observed.
What is chemical property?
During the observation part of the scientific method, this observation uses your senses all of the time.
What is qualitative observations?
This is the number of protons found in an atom.
What is the quantum mechanical model?
These have a negative charge, orbit the nucleus, and are the smallest of the three subatomic particles.
What are electrons?
The ability of one substance to dissolve in another, which is observed as a physical change.
What is solubility?
A well-tested description of one phenomenon in the natural world that often includes mathematical terms.
What is a scientific law?
The sum of the protons and neutrons in the nucleus of an atom.
What is the mass number?
Electrons that are in the highest energy level (the energy level farthest from the nucleus) of an atom of an element.
What is are valence electrons?
These have the greatest part of the mass of an atom.
What is the nucleus?
(Protons and neutrons make up the nucleus and have more mass than electrons that orbit it)
Occurs when a gas changes directly into a solid without first changing into a liquid.
What is deposition?
A logical conclusion drawn from observations, previous knowledge, and available information.
What is an inference?