What is name for the smallest part of an element that still retains the properties of the element?
An atom.
100
Which alkali metal is the least reactive?
Lithium.
100
Which group is known for its explosive reaction with water? (Name and number).
Alkali Metals, group 1.
100
Where are non-metals found on the periodic table?
On the right hand side.
200
Which halogens are gases in their pure elemental forms?
Fluorine, Chlorine
200
What is the name for the smallest part of a compound that still retains the properties of the compound?
A molecule.
200
Which metals don't corrode easily?
The coinage metals.
200
What is the third most common substance in air?
Argon.
200
What is the symbol for silver?
Ag.
300
Which halogen is a liquid?
Bromine
300
What term means "able to be pounded into sheets"?
Malleable.
300
Which group contains essentially unreactive elements?
The Noble gases.
300
Is air mostly composed of molecules or mostly composed of individual atoms?
Mostly composed of molecules. Nitrogen is the most abundant component of air, and it comes as N2 molecules.
300
What is a period in the periodic table?
A horizontal row.
400
Which alkali metal is a liquid?
Francium!
400
What is the difference between a mixture composed of two elements and a compound composed of two elements?
In a mixture, the elements retain their individual properties. In a compound, they lose them.
400
When sodium reacts with water, what gas is formed?
Hydrogen gas.
400
If Potassium explodes in water, how can it be something necessary for our bodies?
Potassium in its neutral element form explodes in water. Our bodies required potassium in its ion form, which comes by way of a compound with other elements.
400
Why might some students think that Hydrogen is a metal?
Because it sits in group 1, on the right side of the periodic table.
500
What is another name for the Noble gases?
The inert gases.
500
What is an allotrope?
Two different forms of the same element. Diamond and graphite are the two allotropes of carbon.
500
How can one element change into another?
By radioactive decay.
500
What are the names of the two rows at the very bottom of the periodic table (numbers 58-71 and 90-103).