{{asɛmtiNe Ɔkyerɛwfo}} | Nhomakorabea | Nneɛma a ɛma wotumi yɛ ade

1

(Explore 1) Which sentence explains why C-12 and C-13 are more prevalent on Earth.

Certain isotopes of an element occur in nature much more frequently than others. For instance, carbon-12 accounts for about 98.9 percent of all carbon atoms in nature. The main factor that affects the frequency of a particular isotope is its stability. Certain isotopes of carbon, such as carbon-12 and carbon-13, are stable.

2

(Explore 1) Some isotopes are unstable. The unstable isotopes will radioactive particles. Eventually they also transform into different elements.

1

(Explore 1) Vocabulary: A isotope that forms from the radioactive decay of an atom; the isotope may or may not be the same element as its parent.

1

(Explore 1) Vocabulary: A isotope is one that changes into different isotopes through radioactive decay.

Question 11

00:43

Question 12

00:51

Question 13

01:03

Question 14

02:04

1

(Explore 2) Inside the nucleus, you would expect all the protons to repel each other...but they don't. This is due to another force acting on them called the force.

1

(Explore 2) Select all true attributes of strong nuclear forces

They are effective only if nucleons are greater than 1x10^-15m apart

They are effective only if nucleons are closer than 1x10-15m apart

They act on all nucleons

They act only on protons

They require similar numbers of protons and neutrons in a nucleus, otherwise the atom may be unstable

4

(Explore 2) Many isotopes of elements that are found in nature are . The protons and neutrons of unstable elements will not naturally stay together...they will eventually . As they undergo radioactive decay, the nuclei will emit particles as they transform. This process can happen very or very .

1

(Explore 2) So far, scientists have found types of naturally occurring radioactive decay. With alpha decay, the daughter isotope will become an entirely different element because it has lost protons. Beta decay involves the emission of beta particles when a decays into a , , and a subatomic particle called an .

3

(Explore 2) Based on this nuclear reaction, the hydrogen started with neutrons and ended with neutrons. Additionally, an electron and a were emited.

Question 20

02:11

Question 21

02:41

Question 22

03:30

6

Radioactive decay of atoms does not happen all at once. It happens and is impossible to predict when and which atoms will decay...it is a process. The only thing that can be determined is the rate of decay, which by isotope. The number of decays is to the number of particles in the sample. The amount of time for half of a sample of a particular isotope to decay is and is known as the half-life of the isotope.

Mmuae Afoforo a Wobɛpaw:

gradually

average

random

constant

varies

proportional

DE_Phys_Unit4_NuclearProcesses

DE_Phys_Unit4_NuclearProcesses

(Explore 1) Which sentence explains why C-12 and C-13 are more prevalent on Earth.

(Explore 2) Select all true attributes of strong nuclear forces

(Explore 1) Which sentence explains why C-12 and C-13 are more prevalent on Earth.

(Explore 2) Select all true attributes of strong nuclear forces