1
When opposite electrical charges attract each other and while the same charges repel each other
The law of electrostatic charges
What exists either as a positively charged cation that lost electrons or is negatively charged anion
Ions
Atoms move only in distinct what
Energy levels
What is the total number of particles in a nucleus
Mass number
Ions that have more protons than electrons and have excess of positive charge
Cations
What Greek Philosopher used Atomos to describe indivisible particles of matter
Democritus
What is a subatomic particle found in the nucleus that carries no electrical charge
Neutron
What model of atoms replaced orbits with orbitals that showed were electrons were likely to be found
Quantum Mechanical model
What model showed that the atom was a dense positively charged central nucleus surrounded by negatively charged electrons
Daily Double --
Nuclear model
Who proposed a comprehensive theory of atoms in 1803
John Dalton
What is slightly more massive than proton
Neutron
What image of an atom reminded some scientist of a traditional English pudding
Daily Double---
Plumb Pudding model
Who discovered electrons in 1897
JJ Thomson
What was the new branch of physics that explored the behavior of matter and energy at the atomic and subatomic levels
Quantum Mechanics
Who had his students confirm the existence of the nucleus
Ernest Rutherford
What is the weighted average of the masses of the element's stable isotopes
Atomic Mass
What are the smallest of main subatomic particles
Electrons
What was a key factor in the development of new atomic models
Workability
Atoms with unequal numbers of protons and electrons
Ions
Atoms of the same _____ always have the same number of protons
Element
What model is still useful for its ability to illustrate some chemical processes despite not being the most up to date model
The Bohr model
What atoms of the same element have differing numbers of neutrons
Isotopes
What indicates the name of an element along with its atomic number and mass number
Isotope notation
Ions that have more electrons than protons and have an excess of negative charge
Anions
What do you call a boy with no arms and legs at your doorstep
Matt