4.2 The Atom

Question 1

Positive charged particles in the nucleus.

Answer 1

Protons

Question 2

The SI unit used to express the mass of particles in an atom.

Answer 2

Atomic mass unit

Question 3

Sparkles of the nucleus that have no electrical charge.

Answer 3

Neutron

Question 4

The number of protons in the nucleus of an atom.

Answer 4

Atomic number

Question 5

Atoms that have the same number of protons but have different number of neutrons.

Answer 5

Isotope

Question 6

Is the sum of the protons and neutrons in an atom.

Answer 6

Mass number

Question 7

An element is the weighted average of the masses of all naturally occurring isotopes of an element.

Answer 7

Atomic mass

Question 8

Acts between all objects all the time. The amount of gravitational force between objects depends on masses and the distance between them. Gravitational force pulls objects such as the sun earth cars and books toward one another. However because the masses of particles in atoms are so small the gravitational force within Adams is very small.

Answer 8

Gravitational force

Question 9

Protons and electrons are attracted to each other because they have opposite charges. The electromagnetic force holds the electrons around the nucleus.

Answer 9

Electromagnetic force

Question 10

Push away from one another because of the electromagnetic force. A nucleus containing two or more protons would fly apart if it were not for the strong force. At the close distance between protons and neutrons in the nucleus the strong force is greater than the electromagnetic force so the nucleus stays together.

Answer 10

Strong Force

Question 11

An important force in radioactive atoms. In certain unstable atoms and you can change into a proton and an electron. The week search plays a key role in this change.

Answer 11

Weak Force