Chapter 4 Flashcards
(18 cards)
What is the smallest unit of an element that maintains the properties of that element?
An atom
What is the smallest unit of an element that maintains the properties of that element?
An atom
What is a subatomic particle that has a negative charge?
An electron
What is in physical science, an atom’s central region, which is made up of protons and neutrons?
A nucleus
What is a subatomic particle that has a negative charge?
An electron
What is in physical science, an atom’s central region, which is made up of protons and neutrons?
A nucleus
What is a region around the nucleus of an atom where electrons are likely to be found?
An electron cloud
What is a subatomic particle that has a positive charge and that is found in the nucleus of an atom?
A proton
What is a unit of mass that describes the mass of an atom or molecule?
An atomic mass unit
What is a subatomic particle that has no charge and that is found in the nucleus?
A neutron
What is the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element?
An atomic number
What is an atom that ha s the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)?
An isotope
What is the mass of an atom expressed in atomic mass units?
An atomic mass
Who was the scientist who thought you could keep cutting something forever and ever without stopping?
Democritus
Who was the scientist who thought atoms of the same element are exactly alike and vise versa?
John Dalton
Who was the scientist who experimented with positive and negative coils?
J.J. Thomson
Who was the scientist who experimented with gold foil and light beams?
Ernest Rutherford
Who was the scientist who thought electrons move around the nucleus?
Niels Bohr
