Chemistry Challenge: Grade 9 Chemistry Trivia

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As you move left along with the periodic table, the atomic number of the elements tends to

Answer: Decrease
As you move left along the periodic table, the atomic number of elements tends to decrease. This is because elements are arranged in increasing order of atomic number from left to right across periods in the periodic table.

An Ionic compound is the result of the bonding of

Answer: A metal and a nonmetal
An ionic compound forms through the bonding of a metal and a nonmetal. Ionic bonds involve the transfer of electrons from the metal to the nonmetal, resulting in the formation of positively charged cations and negatively charged anions. The electrostatic attraction between these oppositely charged ions forms the ionic compound.

What happens/is likely to happen if the atoms within an element have full valence shells?

Answer: They are unlikely to bond with other elements.
When the atoms within an element have full valence shells, it means that they have achieved a stable electron configuration. This stability makes it unlikely for these atoms to bond with other elements because they do not need to gain, lose, or share electrons to achieve a more stable configuration. 

How many valence electrons does an atom require to have a full shell?

Answer: 8
An atom requires 8 valence electrons to have a full shell. The octet rule states that atoms tend to gain, lose, or share electrons in order to achieve a stable configuration with 8 electrons in their outermost shell, which is the most stable electron configuration. This is known as achieving a full shell or achieving the noble gas configuration. 

Beryllium (Valence electrons: 2) more likely to bond with 

Answer: Sulfur (Valence electrons: 6)
Beryllium is more likely to bond with sulfur because they have a compatible number of valence electrons. Beryllium has 2 valence electrons, while sulfur has 6 valence electrons. In order to achieve a stable electron configuration, beryllium can donate its 2 valence electrons to sulfur, forming an ionic bond. This allows both atoms to achieve a full outer electron shell. Neon, on the other hand, already has a full outer electron shell with 8 valence electrons, so it is less likely to form a bond with beryllium. Neon is also a noble gas; noble gases usually do not bond with other elements.

Which and how many atoms do Hydrogen Peroxide (H2O2) consist of?

Answer: Two Hydrogen, Two Oxygen
Hydrogen peroxide (H2O2) is a chemical compound composed of two hydrogen (H) atoms and two oxygen (O) atoms. The chemical structure of hydrogen peroxide can be represented as H-O-O-H, illustrating the arrangement of the atoms. The oxygen atoms are connected by a single bond, and each oxygen atom is also bonded to a hydrogen atom. The presence of peroxide linkage (O-O) contributes to the unique properties of hydrogen peroxide, and it is commonly known for its use as a disinfectant and bleach.
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