ChemAA Unit 1 + 2.1-2.2 Review

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. For example, the atomic number of chlorine is 17.

Front

Will this atom gain or lose electrons to become stable?

Back

Atoms tend to gain or lose electrons to achieve a full outer shell of electrons, which is typically 8 for most elements. Atoms with fewer than 4 valence electrons usually lose electrons, while those with more than 4 tend to gain electrons.

Front

What does malleable mean in terms of metals?

Back

Malleable refers to a property of metals that allows them to be hammered or pressed into thin sheets without breaking.

Front

Describe the particle model of a gas.

Back

In a gas, particles are far apart and have lots of energy, allowing them to move freely and fill the container they are in.

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and nonmetals; they are often semiconductors, meaning they can conduct electricity under certain conditions.

Front

What is the definition of conductivity?

Back

Conductivity is a physical property that describes the ability of a substance to transfer heat or electrical energy.

Front

What is the significance of the periodic table?

Back

The periodic table organizes all known elements by their properties and atomic numbers, providing a useful reference for understanding chemical behavior.

Front

What is an ion?

Back

An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net electrical charge.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is a substance formed when two or more different elements chemically bond together.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to gain, lose, or share electrons to achieve a full outer shell of eight electrons, leading to greater stability.