Atomic Structure and Mass

What are the three types of particles that make up an atom?

• Protons, neutrons, and photons

• Neutrons, electrons, and positrons

• Protons, neutrons, and electrons

• Electrons, photons, and quarks

Why can the mass of electrons be ignored when calculating the mass of an atom?

• Because electrons are not found in the nucleus

• Because electrons have a negligible mass compared to protons and neutrons

• Because electrons have a negative charge

• Because electrons are not part of the atom

How many protons does a hydrogen atom have?

• Two

• One

• Zero

• Three

What is the total mass of a helium atom?

• 2

• 5

• 3

• 4

How many neutrons are present in a fluorine atom with an atomic number of 9 and a total mass of 19?

• 8

• 11

• 9

• 10

What is the atomic number of scandium?

• 22

• 20

• 21

• 19

How many neutrons does scandium have if its atomic number is 21 and its relative atomic mass is 45?

• 22

• 25

• 23

• 24

What is the relative atomic mass of zinc?

• 65.4

• 67.2

• 64.5

• 66.3

Why is it puzzling to have a fractional number of neutrons in an atom?

• Because neutrons have no charge

• Because neutrons cannot be divided into fractions

• Because neutrons are heavier than protons

• Because neutrons are not part of the nucleus

What will the next video likely address based on the current video's ending?

• The discovery of new elements

• The structure of the electron cloud

• The charge of protons and neutrons

• The reason behind fractional atomic masses