Fill in the blank

The last family of elements to be discovered where the blank

Noble gases

Helium rather than flammable hydrogen is used in blimps because helium is blank

Non flammable

Elements can be divided into three groups: metals, blank and blank

Nonmetals and metalloids

A horizontal row on the periodic table is called a blank

Period

Blank was named for the special property it has - it glows in the dark

Phosphorus

When blue copper 11 chloride crystals spread out evenly in water a blank change has occurred

Physical

In a gas, an increase in energy causes an increase in blank as the particles hit the walls of the container with more speed

Pressure

Early chemists believed that if a substance broke down into components with fixed blank it was a compound

Ratios

Metalloids can also be called blank

Semi metals

The particles in liquid vibrate, as they do in solids, but they also blank

Slide/move past each other

U is the symbol for the element blank

Uranium

Matter is anything that has blank and blank

Volume and mass

Two naturally occurring substances that are non-flammable and able to cool and smother fires are blank and blank

Water and carbon dioxide

A blank is a pure substance composed of two or more elements chemically combined

Compound

Gold, compared to all other metals, is the best blank of electricity

Conductor

A molecule of methane CH4 contains blank parts carbon and blank parts hydrogen

1 and 4

Mendeleev grouped elements with similar properties into blank

Columns

Magnesium flares are used to provide a bright light in emergencies. Magnesium reacts with oxygen in a blank reaction

Combustion

Pumice floats in water because it has a lower blank

Density

Sam soft metals are blank because they can be drawn into thin wires

Ductile

Nonmetals generally have a blank lustre

Dull

Pure substances composed of identical atoms are termed blank

Elements

Hot water dissolves materials more quickly than cold water. As the water particles are traveling more rapidly they are able to give more blank to the dissolving material

Energy

A vertical column of elements on the periodic table with similar properties is called a blank

Family

Many nonmetals are in the blank state at room temperature

Gas

Three examples of the noble gases are blank, blank, and blank

Helium, neon, and argon

Sodium reacts with water to produce blank, a flammable gas

Hydrogen

Zinc and magnesium react with acids to produce blank gas

Hydrogen

Blank is the symbol for the element iodine

I

Most medals did not react violently when they get wet. Group blank metals, however do

I

Moving from top to bottom down any group, atomic mass blank

Increases

The symbol for the element blank is Fe

Iron

Sodium has the symbol Na taken from the blank word natrium

Latin

The temperature at which a substance changes from a solid into a liquid is the same temperature at which it changes from a blank into a blank

Liquid into a solid

Particles in blank and blank move in straight lines until they bump into each other or the walls of the container

Liquids and gases

Iron, cobalt, and nickel share a property the other metals do not have. They are blank

Magnetic

Blank are found along the staircase of the periodic table of the elements

Metalloids

The first elements to be discovered were blank

Metals

The element nitrogen has the symbol blank

N

A homogeneous mixture of metals like steel is called a blank

Alloy

An alloy of mercury and other metals is called a blank

Amalgam

Blank and blank sit side-by-side on the periodic table, but are unusual because their atomic masses do not increase from left to right

Argon and potassium