Unit 2 Review: Periodic Table & Atomic Structure

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and nonmetals. They are often semiconductors and are found along the zig-zag line on the periodic table.

Front

Why is the electron not included in atomic mass calculations?

Back

The electron is not included in atomic mass calculations because its mass is basically zero compared to protons and neutrons.

Front

What is the mass of a neutron?

Back

The mass of a neutron is approximately 1 atomic mass unit (amu).

Front

Where are metalloids located on the periodic table?

Back

Metalloids are located touching or bordering the zig-zag 'staircase' on the Periodic Table.

Front

What does a 4+ charge on an ion indicate about its electrons?

Back

A 4+ charge indicates that the ion has lost 4 electrons.

Front

How many protons does a lead ion with a charge of 4+ have?

Back

A lead ion with a charge of 4+ has 82 protons.

Front

What is the charge of an electron?

Back

The charge of an electron is negative.

Front

What is the atomic number of an element?

Back

The atomic number of an element is the number of protons in its nucleus.

Front

What is the difference between an atom and an ion?

Back

An atom is neutral, having equal numbers of protons and electrons, while an ion has a net charge due to the loss or gain of electrons.

Front

What are the three main subatomic particles?

Back

The three main subatomic particles are protons, neutrons, and electrons.