Vocab
The smallest chemical unit of an element.
What is an atom?
Democritus thought if he were to cut a grape until it was uncuttable, he would be left with what?
What is an atom?
These are negatively charged and are the smallest of the 3 subatomic particles.
What are electrons?
This is how many electrons oxygen has with an atomic number of 8.
What is 8 electrons?
John Dalton's atomic theory states that all _____________ is made of tiny particles called atoms.
What is matter?
The number of protons in an atom. Listed at the top of an element in the periodic table.
What is the atomic number?
Aristotle disregarded the theory of an atom, saying everything is made up of four elements: fire, earth, air, and this final element.
These have a neutral charge and are located in the nucleus.
What are the neutrons?
This is how many electrons carbon has if it has an atomic number of 6.
What is 6 electrons?
This is the energy level that has electrons with the most energy.
What is the highest energy level?
The sum of the protons and neutrons in the nucleus of an atom. Listed at the bottom of the element in the periodic table.
What is the mass number?
John Dalton's atomic model is based on the Law of Conservation of _______ which states that matter cannot be created nor destroyed, but changes from one form to another.
What is Mass?
These are positively charged and are located in the nucleus.
What are protons?
This is how many protons and neutrons carbon has if it has an atomic mass of 13?
What is 13?
The electrons in the highest energy level (farthest from the nucleus) of an atom of an element.
What are valence electrons?
After Rutherford's gold foil experiment, he concluded that there must be a center, positively charged mass which he called the ______________.
What is the nucleus?
This is where the greatest part of the mass of an atom is found and is composed of the protons and neutrons.
What is the nucleus?
This is how many neutrons an atom has if it has an atomic number of 20 and atomic mass number of 38.
What is 18?
This is the group on the periodic table which is the most reactive.
What are the alkali metals in Group 1A?
Theory that states that matter cannot be created nor destroyed but changes from one form into another.
Niels Bohr's atomic model suggested that electrons that are farther away from the nucleus have this energy level: higher or lower.
What is higher?
This is what subatomic means.
What are the parts of an atom? Or smaller than an atom?
Sodium has an mass number of 23 and an atomic number of 11. This is how many neutrons it has.
What is 12?
This is the group on the periodic table that is the least reactive.
What are the noble gases or Group 8A?