Lesson 1: Atomic Structure

Question 1

What is the radius of an atom?

Answer 1

1 x 10⁻¹⁰m

Question 2

What is the radius of a nucleus in comparison to the radius of an atom?

Answer 2

• Radius of nucleus is less than 1/10000th of radius of atom.

Question 3

Where is most of the mass of atom concentrated?

Answer 3

• Most of mass concentrated in nucleus.

Question 4

What causes an electron to move to a higher energy level?

Answer 4

• Absorption of electromagnetic radiation (electron moves further away from nucleus to higher energy level.)

Question 5

What causes an electron to move to a lower energy level?

Answer 5

• Emission of electromagnetic radiation (move closer to nucleus/ lower energy level.)

Question 6

What is the basic structure of an atom?

Answer 6

The basic structure of an atom is a positively charged nucleus composed of both protons and neutrons surrounded by negatively charged electrons.

Question 7

What are isotopes?

Answer 7

• Isotopes are atoms of the same element with a different number of neutrons.
• Isotopes of the same element have different mass numbers.

Question 8

When can atoms turn into positive ions?

Answer 8

Atoms turn into positive ions if they lose one or more outer electron(s).

Question 9

Do 2 isotopes of the same element have the same charge? Explain why?

Answer 9

• Yes
• Because same number of protons