Atomic Structure-Atoms And Isotopes

Question 1

Give an approximation for the radius of an atom?

Answer 1

1x10 to the power of -10 meters

Question 2

What are the three subatomic constituents of an atom?

Answer 2

Proton
Neutron
Electron

Question 3

Where is most of the mass of an atom concentrated?

Answer 3

In the nucleus

Question 4

Approximately what proportion of the total radius of an atom is the radius of the nucleus?

Answer 4

1/10,000

Question 5

Describe the arrangements of protons, neutrons and electrons in an atom?

Answer 5

The protons and neutrons are found in the atoms nucleus

The electrons are found in discrete energy levels around the nucleus

Question 6

What type of charge does the nucleus of an atom have? Why?

Answer 6

Positive charge
The nucleus contains protons and neutrons
Protons are positive and neutrons have no charge

Question 7

Give two ways that an atoms electrons arrangement can be changed?

Answer 7

Absorbing electromagnetic radiation
Emitting electromagnetic radiation

Question 8

Explain how an atoms electron arrangement changes when it absorbs EM radiation?

Answer 8

Electrons move further away from nucleus
They move to a higher energy level

Question 9

Explain how an atoms electron arrangement changes when it emits EM radiation?

Answer 9

Electrons move closer to nucleus
They move to a lower energy level

Question 10

How does the ratio of electrons to protons in an atom result in the atom having no overall charge?

Answer 10

The number of protons is equal to the number of electrons
Protons and electrons have equal and opposite charges, so charge cancels

Question 11

What do all forms of the same element have in common?

Answer 11

They all have the same number of protons

Question 12

What is the name given to the number of protons in an atom?

Answer 12

Atomic number

Question 13

What is an atoms mass number?

Answer 13

Total number of protons and neutrons in an atom