Understanding Atoms and Ions

The video tutorial explains the concept of atoms and ions. It begins with a discussion on atoms, highlighting their neutral nature due to an equal number of protons and electrons. The tutorial then introduces ions, which are atoms that have gained or lost electrons, resulting in a charge. Using lithium and chlorine as examples, the video demonstrates how atoms become ions by losing or gaining electrons, respectively. The tutorial emphasizes the importance of electron balance in determining the charge of an atom or ion.

What makes an atom neutral?

• Equal number of protons and electrons

• Equal number of protons and neutrons

• More electrons than protons

• More protons than electrons

What happens to an atom when it becomes an ion?

• It gains or loses both protons and neutrons

• It gains or loses electrons

• It gains or loses neutrons

• It gains or loses protons

What is the atomic number of lithium?

• 10

• 7

• 3

• 4

How many neutrons does lithium have if its mass number is 7 and atomic number is 3?

• 4

• 10

• 3

• 7

What charge does a lithium ion have after losing one electron?

• 2-

• 1+

• 1-

• 2+

What happens to an atom when it loses electrons?

• It becomes negatively charged

• It becomes positively charged

• It remains neutral

• It becomes unstable

What is the mass number of chlorine?

• 19

• 17

• 53

• 36

How many protons does chlorine have?

• 17

• 36

• 19

• 53

What charge does a chlorine ion have after gaining one electron?

• 2+

• 2-

• 1+

• 1-

Why do atoms form ions?

• To change their atomic number

• To increase their mass

• To lose energy

• To become more stable