The periodic table is arranged by groups and periods. The groups are vertical columns that go by number of valence electrons. The periods are horizontal rows that increase going down in number of electron shells. The noble gasses are all on the right side, and they have full valence electron shells.
Ions of the same element have the same number of protons and mass, but they have a different number of electrons, valence electrons, and neutrons. An ion is formed when an element gains or loses electrons. If it loses electrons, it becomes more positively charged, as electrons have a negative charge. If it gains electrons, it has more of a negative charge. If you look on the periodic table, you will see the elements electron configuration. This also shows how many valence electrons an element has. You can see the charge in the top right corner.
Tuesday, October 25, 2011
Tuesday, October 18, 2011
Lab 2.1 Grouping of Elements
1. The groupings of elements we made were:
Aluminum and lead
Carbon, Silicon, and Tin
Sulfur and phosphorous.
2.Appearance- Physical. It doesn't have to do with anything chemically, it's just how it looks.
Electrical conductivity- Chemical. Depending on what kind of atoms make up the element decides if it will hold an electric current.
Crush Test- Chemical. It depends on how tightly the atoms are packed together.
Reactivity With Acid- Chemical. An element reacting with something is a chemical property because it depends on how the atoms are formed.
3. A. What is unique about metalloids is that they can have properties of both metals and non metals, depending on the conditions.
B. Silicon. It is shiny, has some electrical conductivity, is brittle and does not react with acid.
C. Boron- B, Silicon- Si, Germanium- Ge, Arsenic- As, Antimony- Sb, Tellurium- Te, and Polonium- Po.
4.From top to bottom, the elements go from shiny to dull.
From right to left, the elements go from dull to shiny.
Enrichment:
Silver-Ag comes from the latin word argentum, which means 'white metal' in English.
Aluminum and lead
Carbon, Silicon, and Tin
Sulfur and phosphorous.
2.Appearance- Physical. It doesn't have to do with anything chemically, it's just how it looks.
Electrical conductivity- Chemical. Depending on what kind of atoms make up the element decides if it will hold an electric current.
Crush Test- Chemical. It depends on how tightly the atoms are packed together.
Reactivity With Acid- Chemical. An element reacting with something is a chemical property because it depends on how the atoms are formed.
3. A. What is unique about metalloids is that they can have properties of both metals and non metals, depending on the conditions.
B. Silicon. It is shiny, has some electrical conductivity, is brittle and does not react with acid.
C. Boron- B, Silicon- Si, Germanium- Ge, Arsenic- As, Antimony- Sb, Tellurium- Te, and Polonium- Po.
4.From top to bottom, the elements go from shiny to dull.
From right to left, the elements go from dull to shiny.
Enrichment:
Silver-Ag comes from the latin word argentum, which means 'white metal' in English.
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