Chemical Formula
It represents the number and type of atoms in a chemical compound.
Chemical Formula
What is the difference between a cation and an anion?
A cation is a positively charged ion (loses electrons), while an anion is a negatively charged ion (gains electrons).
Give an example of monoatomic cation and a monoatomic anion.
Correct! Hehe
In the formula Ca(OH)₂ ________are used to group the polyatomic ion (OH⁻) to show that there are two hydroxide ions in the formula.
Parentheses
Which type of elements tend to form cations?
Metals (such as sodium, calcium, and lithium) tend to form cations because they lose electrons.
What are the common charges for monoatomic ions formed by: Group 1, Group 2 and Group 3?
Group 1 (+1)
Group 2 (+2)
Group 3 (+3)
How many atoms of each element are present in Al₂(SO₄)₃?
Aluminum (Al): 2
Sulfur (S): 3
Oxygen (O): 12 (because SO₄ appears 3 times, and each SO₄ has 4 oxygens → 3 × 4 = 12)
Which type of elements tend to form anions?
Nonmetals (such as oxygen, chlorine, and sulfur) tend to form anions because they gain electrons
Which group of the periodic table typically forms monoatomic ions with a -2 charge?
Group 6
Determine the number of atoms of each element in the following:
Fe₂(CrO₄)₃
Fe₂(CrO₄)₃
Iron (Fe): 2
Chromium (Cr): 3
Oxygen (O): 12 (since CrO₄ appears 3 times → 3 × 4 = 12)
_______ rule states that atoms tend to gain, lose, or share electrons to achieve eight valence electrons, making them more stable.
Octet
Why don’t noble gases (Group 18) form monoatomic ions?
Noble gases already have a full octet (8 valence electrons), so they do not need to gain or lose electrons.
What is the chemical formula for a molecule that contains 6 carbon, 12 hydrogen, and 6 oxygen atoms?
Answer: C₆H₁₂O₆ (glucose)
Between Sodium and Fluorine, which is most likely to be a cation and an anion?
Sodium (Cation)
Fluorine (Anion)
Compare the size of a cation and an anion relative to their neutral atoms.
Cations are smaller than their neutral atoms because they lose electrons, reducing electron repulsion.
Anions are larger than their neutral atoms because they gain electrons, increasing electron repulsion.