1.1 - Atomic Structure

Question 1

Where is a proton located, what is it’s charge, and what is it’s mass?

Answer 1

• nucleus
• +1 charge
• 1 u

Question 2

Where is a neutron located, what is it’s charge, and what is it’s mass?

Answer 2

• nucleus
• no charge
• 1 u

Question 3

Where is an electron located, what is it’s charge, and what is it’s mass?

Answer 3

• orbitals around the nucleus
• (-1) charge
• approx. 0

Question 4

What is an atomic number?

Answer 4

• its the number of protons in an element
• elements are listed in order of atomic number
• no two elements have the same atomic number

Question 5

What is atomic mass?
How do you calculate it?

Answer 5

• Atomic mass is the weight of an element, typically the average of each of it’s isotopes.
• Atomic mass = (# of protons) + (# of neutrons)