Periodic Table 1
What is atomic mass?
The sum of protons and neutrons
Who is the father of the periodic table?
Dmitri Mendeleev
In which group can Elements be cut with a knife?
Group 1 (alkali metals)
What are the outer shells of an atom called?
Valence shells
What happens to the reactivity of group 1 metals as we go down the group?
Become more reactive
The three classes of elements are these.
What are metals, nonmetals, metalloids?
The elements in column 18.
What is Noble Gases?
Elements in the same group share these characteristic
What are chemical and physical properties?
As we go down group 1, what happens to the softness or hardness of the metals?
They get softer
Why do group 1 metals become more reactive as we move down the group?
As we go down the group, they have more electron shells which means its easier for them to "give an electron away"
What is the word equation for lithiums reaction with water?
Lithium + water---> Lithium hydroxide + hydrogen
Mendeleev organized the elements of his periodic table according to this.
What is increasing atomic mass?
The reactive elements in group 2 are known as this.
What are alkaline earth metals?
The vertical columns of the periodic table
groups/families
These metals are the most reactive
Alkali metals
These are the properties of nonmetals.
What are brittleness, low boiling/melting points, dull, and are good insulators (nonconductive)? Must get 2/3
Which group often form diatomic molecules?
Group 7
Extremely reactive elements in group 1 have only 1 valence electron and are known as this.
What are alkali metals?
What is the name of the alkali formed when sodium reacts with water?
Sodium hydroxide
These nonmetals are found in group 17
What are halogens?
This class of elements have properties of both metals and nonmetals.
What are metalloids?
How many electrons does Chlorine need to gain/lose to have a full outer shell?
It needs to gain one electron
What are metalloids?
Elements that share some of the properties of metals and non-metals
Describe the gas production when lithium reacts with water.
It fizzes slowly and produces a few bubbles
A row on the periodic table.
What is period?