Vocabulary
Positively charged particles of an atom that are located in the nucleus.
What is a proton?
In 400 BC, this scientist developed the idea of the atom and called it atomos (uncuttable).
Who is Democritus?
All atoms of any given element have the same number of ________.
What is protons?
The elements in group 1A have ____ valence electrons.
This element has the chemical symbol of C.
What is Carbon?
Matter cannot be created or destroyed, but it can change form.
What is the Law of Conservation of Mass?
William Thomsom created this model with negative charged particles spread evenly throughout.
What is the Plum Pudding Model?
Which is the least massive subatomic particle?
What are electrons?
The elements in each column share similar _____.
What is properties?
Name the chemical symbol for Nitrogen.
What is N?
The number of protons in an atom.
What is an atomic number?
Who made the first complete attempt to describe matter in terms of atoms?
Who is John Dalton?
The electrons in the highest energy level play an important role in ____ ____?
What is Chemical Reactions?
In the Periodic Table, the columns are called _____ or _____.
What is groups or families?
Name the chemical symbol for Hydrogen.
What is H?
Electrons that in the highest energy level of an atom of an element.
What are Valence electrons?
Who conducted the gold foil experiment to discover the nucleus of an atom?
Who is Ernest Rutherford?
If Argon's atomic number is 18, then how many electrons and nuetrons are in Argon-38?
What is 18 electrons and 20 neutrons?
The elements in group 8A are called ______ , have ___ valence electrons (except helium), and are useful because they do not ______ with other elements.
What are Noble Gases, 8 valence electrons, and react?
This element has the chemical symbol of Al.
What is Aluminum?
Atoms of an element with the same number of protons but different numbers of neutrons.
What are isotopes?
Niels Bohr created this model that is seen the most often today.
What is the Electron Cloud model?
Which element is required for all of life?
What is Carbon?
The Russian chemist and teacher who first grouped elements together in a table by their properties was __________.
Who is Dmitri Mendeleev?
This element has the chemical symbol of Na.
What is Sodium?