The dense part of an atom that contains protons and neutrons.
What is a nucleus?
100
Scientist that proposed atoms have a nucleus
Who is Rutherford?
100
These elements are shiny, malleable, ductile, and are good conductors of electricity
What are metals?
100
The positively charged part of an element
What is a proton?
100
A pure substance that cannot be separated into simpler substances by physical or chemical means
What is an element?
200
The smallest particle into which an element can be divided and still be a substance.
What is an atom?
200
British scientist credited with the discovery of electrons
Who is Thomson?
200
Element with a chemical symbol is Fe
What is iron?
200
Part of elements that have no charge
What are neutrons?
200
The weighted average of the masses of all the naturally occurring isotopes of an element.
What is an atomic mass?
300
The number of protons in the nucleus of an atom
What is the atomic number?
300
Credited with arranging the elements, in order of increasing atomic mass, into a periodic table.
Who is Dmitri Mendeleev?
300
Element with a chemical symbol of Au.
What is gold?
300
An abbreviation used to represent an element.
What is a chemical symbol?
300
Happening at regular intervals
What is periodic?
400
The charge of an electron
What is negative charge?
400
Method of depicting the valence electrons of an element
What is the electron dot or Lewis structure?
400
Part of the periodic table that indicates the number of electrons in a valence shell.
What is the group number?
400
It's chemical symbol is Na
What is sodium?
400
A pure substance composed of two or more elements that are chemically combined.
What is a compound?
500
The outermost electron shell of an element
What is a valence shell?
500
Scientist credited with proposal that electrons move around the nucleus in certain paths, or energy levels. He drew a representation of an element to demonstrate his theory.
Who is Bohr?
500
Part of the periodic table that indicates the number of electron shells in an element
What are the period numbers?
500
Group 18 on the periodic table
What are the Nobel gases?
500
Elements that have properties of both metals and non metals