Changes In The Nucleus

Question 1

The Atomic Number or a Nucleus is the Number of ___________ in it.

Answer 1

Protons.

Question 2

The Mass Number of a Nucleus is the Number of Protons Plus ___________ in it.

Answer 2

Neutrons.

Question 3

What are Isotopes?

Answer 3

Atoms of the Same Element with Different Numbers of Neutrons.

Question 4

An Alpha Particle is Made Up of Two Protons Plus Two ____________. The Charge is ____.

Answer 4

Neutrons…+2…

Question 5

When an Unstable Nucleus Emits an Alpha Particle:

Answer 5

• Its Atomic Number Goes Down by 2, and its Mass Number Goes Down by 4.
• The Mass and Charge of the Nucleus are Both Reduced.

Question 6

A Neutron in the Nucleus Changes into a Proton and the Beta ___________.

Answer 6

Particle.

Question 7

When an Unstable Nucleus Emits a Beta Particle:

Answer 7

• The Atomic Number of the Nucleus Goes Up by 1, and its Mass Number is Unchanged.
• The Charge of the Nucleus is Increased, and the Mass of the Nucleus is Unchanged.

Question 8

A Gamma Ray is Unchanged and Has No ______. So its Emission doesn’t Change the Number of Protons or Neutrons in a ___________.

Answer 8

Mass…Nucleus…

Question 9

Neutrons are Emitted by Some ______________ Substances as a Result of Alpha Particles Colliding with ___________ Nuclei in the Substance.

Answer 9

Radioactive…Unstable…