Unit 3

Question 1

Nucleus

Answer 1

Center of atom, + charge, has p+ and n0, mass of atom

Question 2

Pros of Nuclear Energy

Answer 2

Less Co2, less waste, use fuel from nuclear warheads, reliable

Question 3

Cons of Nuclear Energy

Answer 3

Long time to build, Co2 made during construction, mining for fuel

Question 4

Alternative energy sources

Answer 4

Wind, Solar, hydroelectric, geothermal

Question 5

Isotope

Answer 5

Same element (p+), different mass (n0)

Question 6

Mass Number

Answer 6

p+ + n0 rounded on P.T

Question 7

Add a proton

Answer 7

Change Element (Forward on P.T + Mass goes up)

Question 7

Average atomic mass

Answer 7

Includes all isotopes decimals on P.T, rounds to most abundant isotope

Question 8

Remove a proton

Answer 8

Change Element (Backward in P.T + Mass goes down)

Question 9

Add a neutron

Answer 9

Change Mass (Isotope increase)

Question 10

Remove a neutron

Answer 10

Change Mass (Isotope decrease)

Question 11

Why do neutrons exist?

Answer 11

Keep p+ from ripping atom apart when they repel

Question 12

What makes an isotope stable?

Answer 12

Correct ratio of p+ to n0

Question 13

By looking at a graph of protons vs neutrons, how can you tell if an isotope is stable?

Answer 13

Grey zone of stability

Question 14

Why do atoms decay?

Answer 14

To correct P+ to n0 ratio, and to become stable

Question 15

When do atoms stop decaying?

Answer 15

When p+ and n0 ratio becomes stable

Question 16

Alpha Decay

Answer 16

Take 4/2 He out of nucleus, move 2 backward in P.T

Question 17

Beta Minus Decay

Answer 17

Take 0/-1 e out, change n0 to p+, move 1 forward in P.T

Question 18

Gamma

Answer 18

Take out 0/0 γ out, lots of energy, same isotope

Question 19

Half-life

Answer 19

Amount of time it takes for 1/2 of radioactive sample to decay and become stable.