Unit 5 Test Review - Elements

Front

How many periods are there in the periodic table?

Back

There are 7 periods in the periodic table.

Front

How many neutrons does Chlorine have?

Back

Chlorine has 18 neutrons.

Front

A neutral atom of _____________ has 52 electrons.

Back

Tellurium has 52 electrons.

Front

What is the chemical symbol for Sodium?

Back

The chemical symbol for Sodium is Na.

Front

Who arranged the periodic table of elements by the atomic mass (or mass number)?

Back

Dmitri Mendeleev arranged the periodic table by atomic mass.

Front

What is the atomic number of Chlorine?

Back

The atomic number of Chlorine is 17.

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the significance of the atomic number?

Back

The atomic number represents the number of protons in an atom's nucleus and determines the element's identity.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average mass of an element's isotopes, while mass number is the total number of protons and neutrons in an atom.

Front

What are the three main types of elements in the periodic table?

Back

The three main types of elements are metals, nonmetals, and metalloids.