Unit 1-Isotopes Flashcards Preview

Chemistry 11 > Unit 1-Isotopes > Flashcards

Flashcards in Unit 1-Isotopes Deck (37)
Loading flashcards...
1

What is a radioisotope? Example

An isotope that is unstable. Radioisotopes have too many protons for the number of neutrons that can control them. (hold the nucleus together)

Uranium – 238 is an example it emits radiation

2

What is Isotopic notation?

Mass number in top left corner
Atomic number in the bottom left corner
top right corner is charge

3

Do an isotopic notation question

Go

4

ARAM question

Did you remember units?

5

What are the three types of radiation?

Alpha beta and gamma

6

Draw the symbol for Alpha

Fish

7

Draw the symbol for Beta

B

8

What is the symbol for gamma?

Taurus

9

What happens to the nucleus when an alpha particle is released?

Loss of two neutrons and two protons

10

What happens to the nucleus when a beta particle is released?

A neutron is converted into a proton and an electron is released from the nucleus

11

What happens when a GammaRay is released?

The nucleus lowers in energy

12

What is the penetration in the air for an alpha particle and an effective barrier?

A few centimeters and a piece of paper

13

What is the penetration air for a beta particle and what is an effective barrier?

A few meters in 1 to 2 mm of metal

14

What is the penetration in the air of a gamma ray and what is an effective barrier?

It is unlimited and 1 metre of lead or concrete.

15

What is a beta particle?

A fast-moving electron from the nucleus

16

What is an alpha particle?

Positively charged nuclear particle it looks like helium

17

What is a Gamma Ray?

Energy released from an atomic nucleus

18

Half life question

Hi

19

Alpha or beta question

.

20

What is an isotope? Example

Atoms with the same number of protons but different number of neutrons are isotopes of each other
Li-6 Li-7

21

what are the benefits and risks of radioisotopes?

useful in screening cancer and X-rays
causes damage to living tissue
can result in mutation
radiation sickness
cancer and death

22

what is carbon-14 dating used for and how does it work?

it is used to measure the amount of time since organism died
using the ratio of carbon-14 atoms.
using the half life of carbon we can use the amount left to calculate the amount of time that has passed.

23

Draw Bohr diagrams

-

24

ARAM

Average Relative Atomic Mass

The masses on the periodic table are averages.

Out of 1000 atoms

25

Radioisotopes
what do neutrons do to stabilize the nucleus?

While protons repel each other,
neutrons keep them apart and exert an attractive force (QUARKS)

there is an ideal ratio

26

ion

an atom that has required a charge as result of losing or gaining electrons

27

atom

The smallest particle of an element which still retains the elements' properties

28

atomic number

The number of protons in the nucleus

29

proton

A positively charged particle in the nucleus with the mass of 1 AMU

30

neutron

A neutral particle (change zero) in the nucleus with the mass of one AMU