Physics Review Section 1

Question 1

Atoms are made of :

Answer 1

Protons/Neutrons/Electrons

Question 2

Protons Size

Answer 2

1.67 X 10^-27 kg

Question 3

Neutrons Size

Answer 3

1.67 X 10^-27 kg

Question 4

Electrons Size

Answer 4

9.1 X 10^-31kg

Question 5

The nucleus is ___fermi’s in radius ?

Answer 5

1-7 fermi’s

Question 6

A fermi(fm)=

Answer 6

10x^-15

Question 7

The electron cloud is approximately :

Answer 7

1-3 Angstrom

Question 8

An angstrom is equal to :

Answer 8

10^-8 cm

Question 9

Protons Charge

Answer 9

+ 1.6 X 10^-19 coulombs

Question 10

Electrons charge

Answer 10

-1.6 X 10^-19 coulombs

Question 11

Neutrons charge

Answer 11

None

Question 12

If charges are the same they will :

Answer 12

Repel each other

Question 13

If charges are the opposite they:

Answer 13

Attract each other

Question 14

How do you get an ion?

Answer 14

Under certain circumstances this atom might lose an electron or the nucleus might capture an electron. Any atom with a net( off balance) is an ion

Question 15

Atom with 2 protons and 1 electron equals a off balance charge (more positive) which makes this an:

Answer 15

Ion

Question 16

What is an element?

Answer 16

Atoms with a particular number of protons are called an element.

Question 17

Molecules are.

Answer 17

Elements that combine to form a new element

Question 18

How atoms are put together determines :

Answer 18

What they make up

Question 19

Atomic number is

Answer 19

Protons

Question 20

Electrons are held in place by energy the energy is in electron ____?

Answer 20

volts

Question 21

An ________ volt is the amount of energy acquired by an electron as it accelerates by 1 volt in potential difference.

Answer 21

Electron

Question 22

As shells increase the amount of energy that holds an electron to its shell ____

Answer 22

Decreases

Question 23

The amount of energy that it takes to knock an electron out its shell

Answer 23

Binding Energy

Question 24

Each element has its own ____

Answer 24

Binding energy

Question 25

As the ____ of the element increase the binding energy increases

Answer 25

Atomic #

Question 26

Electrons like to stay in the _____ possible shell until it fills up

Answer 26

Lowest

Question 27

If binding energy is exceeded on an e- it can leave its

Answer 27

Shell

Question 28

When electrons leave the atom they can do two things _______

Answer 28

Ionization or Excitation

Question 29

Ionization is when

Answer 29

A atom completely leaves the atom and is positively charged ion

Question 30

Excitation

Answer 30

Is when a electron moves to a higher shell

Question 31

We can distinguish different types of ______or elements by their Z#

Answer 31

Atoms

Question 32

We can distinguish different types of nuclei by their _______&_____

Answer 32

Z# and A#

Question 33

Elements with a low #Z will require a ______ratio to be stable

Answer 33

1:1

Question 34

Elements with a low #Z will require a ______ratio to be stable

Answer 34

1:1

Question 35

As the Z# increases the ratio ___

Answer 35

Increases

Question 36

What is a radioactive chain is 99Mo decay

Answer 36

99Mo——99mTc—-99Tc—-99Ru