Ions and Atomic Structure Concepts

The video tutorial explains how to determine the number of protons and electrons in the oxide anion (O2-). It begins by discussing neutral oxygen on the periodic table, highlighting that its atomic number is eight, which equals the number of protons. The video then contrasts ions with neutral elements, noting that the difference lies in the number of electrons. For the O2- anion, the video calculates that it has ten electrons due to the addition of two extra electrons. Finally, it explains how atoms become ions by gaining or losing electrons, affecting their charge.

What is the main focus of this video tutorial?

• Studying the properties of metals

• Learning about chemical reactions

• Understanding the structure of the periodic table

• Finding the number of protons and electrons in the O2- ion

What is the atomic number of oxygen on the periodic table?

• 7

• 9

• 6

• 8

In a neutral oxygen atom, how do the number of protons compare to the number of electrons?

• The number of protons is double the number of electrons

• The number of protons and electrons are equal

• There are more electrons than protons

• There are more protons than electrons

What is the charge of a neutral element on the periodic table?

• Variable

• Positive

• Zero

• Negative

What is the key difference between ions and neutral elements?

• The atomic mass

• The number of neutrons

• The number of protons

• The number of electrons

How many electrons does the O2- ion have?

• 8

• 9

• 10

• 11

Why does the O2- ion have a negative charge?

• It has lost electrons

• It has an equal number of protons and electrons

• It has more electrons than protons

• It has more protons than electrons

What happens to an atom when it loses an electron?

• It becomes a different element

• It remains neutral

• It becomes a positive ion

• It becomes a negative ion

What is the result of an atom gaining an electron?

• It becomes a positive ion

• It becomes a neutral atom

• It becomes a negative ion

• It becomes a different element