Atoms Flashcards
The smallest piece of matter that still retains the property of the element.
Atom
Protons and neutrons are found in a small positively charged center of the atom which is called this.
Nucleus
Particles with a charge of 1+.
Protons
Neutral particles that do not have an electric charge.
Neutrons
Particles with an electric charge of 1-.
Electrons
The small particles that protons and neutrons are made of.
Quarks
The person who proposed the idea that all atoms make up all substances.
Democritus
Some who made a model of an atom.
John Dalton
A British physicist.
Joseph Thomsom
A british physicist who proposed almost the mass of an atom.
Ernest Rutherford
Niels Bohr
The area around the nucleus of an atom.
Electron Cloud
The number of protons in an atom is equal to a number.
Atomic Number
The of the number of protons and the number of neutrons in the nucleus of an atom.
Mass Number
Atoms of the same element that have different numbers of neutrons.
Isotopes
The weighted average mass of the mixture of its isotopes.
Average Atomic Mass
When the elements are arranged by increasing atomic number.
Periodic Table
A Russian chemist.
Dmitri Mendeleev
He discovering the atomic number and established its physical basis.
Henry Moseley
The vertical columns in the periodic table.
Groups
Uses the symbol of the element and dots to represent the electrons in the outer energy level.
Electron Dot Diagram
The horizontal rows of elements on the periodic table.
Periods
