6.4.1.1 The Structure of an Atom

Question 1

What is the radius of an atom?

Answer 1

• 1 × 10-10 metres

Question 2

What is the basic structure of an atom?

Answer 2

• positively charged nucleus which has protons and neutrons
• surrounded by electrons

Question 3

What is the radius of a nucleus?

Answer 3

• less than 1/10000 of the radius of an atom

Question 4

Where is most of the mass of an atom concentrated in?

Answer 4

• nucleus

Question 5

How are the electrons arranged?

Answer 5

• different distances (energy levels) from nucleus

Question 6

How may the arrangement of electrons change?

Answer 6

• absorption of electromagnetic radiation (move further from the nucleus, which means a higher energy level)
• emission of electromagnetic radiation (move closer to the nucleus, which means a lower energy level)

Question 7

What is the relative charge of a proton, neutron and electron?

Answer 7

• +1
• 0
• -1