Science Midterm Exam (7th Grade, NEW)

Front

What are Noble Gases?

Back

Noble Gases are a group of elements in Group 18 of the periodic table, known for their lack of reactivity due to having a full valence shell. Examples include Argon (Ar) and Krypton (Kr).

Front

What family does Zinc (Zn) belong to?

Back

Zinc (Zn) belongs to the Transition Metals family, which are known for their ability to conduct electricity and heat, and for forming colored compounds.

Front

How do you calculate the number of neutrons in an atom?

Back

To find the number of neutrons, subtract the atomic number from the atomic weight (rounded to the nearest whole number). For example, if an atom has an atomic weight of 9.012 and an atomic number of 4, it has 5 neutrons.

Front

Why is water not on the periodic table?

Back

Water (H2O) is not on the periodic table because it is a compound made of two elements (hydrogen and oxygen), not a single element.

Front

Which of the following are elements: K, Hg, N or H2O, KF, Ne?

Back

K (Potassium), Hg (Mercury), and N (Nitrogen) are elements. H2O (water) and KF (Potassium Fluoride) are compounds.

Front

What are Transition Metals?

Back

Transition Metals are elements found in Groups 3-12 of the periodic table, characterized by their ability to form variable oxidation states and colored compounds.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the atomic weight?

Back

The atomic weight is the average mass of an atom of an element, measured in atomic mass units (amu), accounting for the relative abundance of isotopes.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in fixed proportions.

Front

What are Halogens?

Back

Halogens are a group of elements in Group 17 of the periodic table, known for being highly reactive nonmetals. Examples include Fluorine (F) and Chlorine (Cl).