Name That Element
I am in Group 1 and Period 3.
Sodium
What determines the order of the Periodic Table?
Increasing atomic number.
Extra: similar properties (groups) and number of electron shells (periods).
Draw the electron configuration for oxygen.
2, 6
Which family is the most reactive metal family?
Alkali Metals (Group 1)
Why do elements in the same group have similar properties?
They have the same number of valence (outside shell) electrons, so they react in similar ways.
This element has atomic number 8.
Oxygen
An element is in Group 17. How many valence electrons does it have?
7
Which element has the electron configuration 2,8,1?
Sodium
Which family is the least reactive?
Noble Gases (Group 18)
Why are noble gases stable?
They have full valence electron shells, meaning they are not likely to gain or lose an electron
This element is a metalloid used to make computer chips.
Silicon
An element is in Period 4. How many occupied electron shells does it have?
4
An element has 17 electrons. Write its electron configuration.
2, 8, 7
Name two properties of transition metals.
Conduct electricity and heat
Shiny
Malleable
Ductile
Mostly solids
Why do Group 1 metals react so easily?
They only have 1 valence electron, which is easily lost to form a full outer shell.
This noble gas is found in Period 3.
Argon
Which two pieces of information tell you where an element is located?
Group and period
Which element has the electron configuration 2,8,8?
Argon
Which family contains chlorine and bromine?
Halogens
Why would magnesium conduct electricity but sulfur does not?
Magnesium is a metal, so it has free-moving electrons that conduct electricity. Sulfur is a non-metal, so it is a poor conductor.
I have 20 protons and belong to Group 2.
Calcium
An element has four occupied shells and two valence electrons. Identify its group and period.
Group 2, Period 4
An unknown element has:
Which family contains carbon and silicon?
Carbon Family (Group 14)
Three unknown elements have these properties:
Sample A: Reacts with water and conducts electricity
Sample B: Doesn't react with water but conducts electricity.
Sample C: Doesn't react with water or conduct electricity.
Which sample is most likely a Group 1 metal? Explain your reasoning.
Sample A
Reason: