Chemistry Challenge Elements

Substances that share properties of both metals and nonmetals.

Found on the left side of the Periodic Table.

What is the symbol for Oxygen?

A relatively ____ number of elements make up the Earth's crust, living organisms, atmosphere.

A pure substance that cannot be separated into a simpler substance.

A change from liquid to solid.

Matter is anything that....

Two ore more substances together that are not chemically combined.

The whole identity of the atom is based on how many _____ it has.

A way to measure the volume of a solid by placing it in a known amount of liquid.

Size, density, hardness, color, state of matter are all _____ _____.

Protons are found in the _______ of the atom.

Has a positive charge.

What is the atomic number for Helium?

All of the elements found in the known universe are on the ______.

The main elements are Oxygen and Silicon that compose Earth material.

Approximately how many elements have been found in the universe?

Found along the "stairstep" between the metals and nonmetals.

Substances with a high luster, conduct heat and electricity well, and are malleable.

A change from gas to liquid.

Found on the far right side of the Periodic Table.

A relationship between mass and volume of an object.

Mostly formed of Nitrogen and Oxygen with a few other gases.

What is the symbol for Hydrogen?

The boiling and melting points of an element are both ____ ______.

Characteristics that can be observed without changing the identity of the substance.

A substance with the same composition throughout the matter.

Elements are arranged on the periodic table according to their....

Mostly Hydrogen and Oxygen in the form of water.

Substances with almost no luster, do not conduct well, and are brittle.

The atomic number of an atom is equal to the number of _____.

A change from liquid to gas.

A change from solid to liquid.

How many protons does Lithium have?

The smallest unit of an element.