chapter 10
An atom of gold with 79 protons. 79 electrons and 118 neutrons would have a mass number of
197
if an isotope of uranium ,uranium -235, has 92 protons how many protons does uranium-238 have[number]
92
Ion
A charged atom that forms when the Numbers of electrons and protons are not equal
Atomic mass unit
A unit of mass that describes the mass of an atom or molecule
What is the smallest particle into which an element can be divided and still be the same substance
Atom
Isotope
Atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons
Isotope
Atom that has the same number of protons but different numbers of neutrons
Which of the following determines the identity of an element
Atomic number
Nucleus
Central region of the atom
How would you describe the nucleus
Dense positively charged
The discovery of which particle proved that the atom is not indivisible
Electron
What particle did J.J Thomson discover
Electron
Where are electrons likely to be found
Electron clouds
In Thomsons plum model of the Atom the plums represent
Electrons
Weak force
Enables a neutron to change into a proton and an electron in certain unstable atoms
Strong force
Keeps a nucleus with two or more protons flying apart
Electron
Negatively Charged particle discovered by Thomson
Electron
Negatively charged particle
Neutron
Particle in the center of an atom that has no charge
Neutron
Particle of the nucleus with no electrical charge
Atom
Particle that cannot be cut
Which of the following has the least mass
Proton
Gravitational force
Pulls objects towards one another
Electron cloud
Region where electrons are likely to be found
Atomic number
Represents the sum of protons in the nucleus of an atom
How did Democritus describe atoms
Small hard particles
Mass Number
Some of protons and neutrons in an atom
Proton
Subatomic particle that has a positive charge
Atomic number
The number of protons in the nucleus of an Atom
Mass number
The sum of the protons and neutrons in an atom
Which of the following scientists discovered that atoms contain electrons
Thomson
the smallest particle into which an element can be divided and still be same substance is called an
atom
Dalton believed that
atoms of the same element are exactly alike
which of the following particles has no electric charge
neutron
what did Democritus Dalton Thomson Rutherford and Bohr all have in common
they contributed to the development of the atomic theory
