True or False
Atoms are the smallest particles of matter
What is true?
The person who described the atom as negative charges scattered through a ball of positive charges is
Who is J.J. Thomson?
The negatively charged particle
What are electrons?
The atomic mass of an element is
The average mass of all the isotopes of an element.
Element's properties can be predicted by
What is the location of the periodic table?
With only a few changes, Dalton's atomic theory is still accept today.
What is true?
The term Rutherford gave to the positively charged particles in the nucleus of an atom was
What is protons?
Positively charged particles in the nucleus of an atom
What is protons?
A chart of the elements showing the repeating pattern of their properties is called
What is the periodic table?
The word periodic means
What is in a regular, repeated pattern?
Since the 1930's the model of the atom has changed a great deal.
What is true?
The experiment convinced Ernest Rutherford that the atom has a small, positively charged nucleus is
What is the Gold Foil Experiment?
Atom's positive charged must be clustered in a tiny region in its center
What is a nucleus?
Mendeleev's periodic table had ______ blank spaces left in it, which represented elements that had not yet been discovered
What is 3?
Elements in a column of the periodic table is
What is a group?
Mendeleev also grouped elements that had different properties.
What is false?
The atomic model that resembled planets orbiting the sun is
What is Bohr's?
Electrically neutral particles
What is neutron?
Each horizontal row in the periodic table is called
What is period?
Mendeleev also grouped elements that had similar properties.. true or false?
What is true or false?
Across a period from left to right, the properties of elements change according to # of protons.
What is false?
The three main particles of the modern model of an atom are..
What are protons, neutrons, and electrons?
The unique number of protons in the nucleus of an atom is an element's
What is an atomic number?
The modern number periodic table is now arranged to
What is the atomic number?
_________________ occurs in stars on a huge scale, combines smaller nuclei into larger nuclei, creating heavier elements
What is Nuclear Fusion?