Elements and the Periodic Table

Front

What state of matter are more than half of the nonmetals at room temperature?

Back

Gases

Front

What term did Marie Curie use to describe the spontaneous emission of radiation by an unstable atomic nucleus?

Back

Radioactivity

Front

True or False: Atoms with the same number of protons and different number of neutrons are called alloys.

Back

False

Front

What did Rutherford infer from his gold foil experiment regarding the atom's positive charge?

Back

That an atom's positive charge must be clustered in a tiny region in its center.

Front

How did Mendeleev arrange the first periodic table?

Back

In increasing atomic mass.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What are isotopes?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the significance of the periodic law?

Back

It states that the properties of elements are a periodic function of their atomic numbers.

Front

What are metalloids?

Back

Elements that have properties of both metals and nonmetals.

Front

What is the main characteristic of noble gases?

Back

They are inert and do not readily react with other elements.