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