chapter 10

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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


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