Atomic Structure and Particles

This video tutorial explains how to calculate the number of neutrons in an atom. It begins with a review of atomic structure, focusing on the nucleus and its particles: protons, neutrons, and electrons. The tutorial details the properties of these subatomic particles, including their charge and mass. It then provides step-by-step examples of calculating the number of neutrons in lithium and fluorine atoms using atomic number and atomic mass.

What is the central part of an atom called?

• Nucleus

• Neutron

• Proton

• Electron cloud

Which particle in the nucleus has a positive charge?

• Photon

• Proton

• Electron

• Neutron

What is the charge of a neutron?

• Positive

• Variable

• Negative

• Neutral

How does the mass of an electron compare to that of protons and neutrons?

• Variable

• Larger

• Equal

• Negligible

Which of the following particles is found outside the nucleus?

• Photon

• Electron

• Neutron

• Proton

What is the charge of an electron?

• Neutral

• Negative

• Variable

• Positive

What is the atomic number of lithium?

• 7

• 6

• 9

• 3

How many neutrons are present in a lithium atom with an atomic mass of 7?

• 4

• 3

• 6

• 5

What is the atomic number of fluorine?

• 9

• 10

• 8

• 7

If fluorine has an atomic mass of 19, how many neutrons does it have?

• 11

• 9

• 8

• 10