Search for the Unknown Element Webquest Worksheet
Part 1: Questions to answer:
1. | How many parts does an atom have? Define each part. | An atom has three parts: 1. Protons - the part of an atom that helps to form the nucleus and has a positive charge. 2. Neutrons - the part of an atom that holds no charge. 3. Electrons - Electrons are the smallest part of the atom. They have no known components or substructure, and they have a negative charge. |
2. | Describe how to find the number of neutrons in an element. | To find the number of neutrons in an atom, subtract the atomic number from the atomic weight and this gives you the number of neutrons for that element. |
3. | How many protons, neutrons, and electrons are in the element Magnesium? | Protons = 12 Electrons = 12 Neutrons = 12 |
4. | What subatomic particle determines which element an atom is? How do you know that? | The number of protons in a nucleus determines the identity of the atom. This number is called the atomic number. |
Part 2: Questions to answer:
1. | Are Rows horizontal or vertical?. | Horizontal |
2. | What do the elements in a row have in common? | All of the elements in a row (or period) have the same number of atomic orbitals. |
3. | Are Groups horizontal or vertical? | Vertical |
4. | What do the elements in a group have in common? | The elements in a group have the same number of electrons in their outer orbital. |
Fill in this chart as you learn about the different groups on the Periodic Table:
Group # | Name | Metals or Nonmetals | Special Properties |
1 | Alkali Metals | Metals | highly reactive, low density, largest atomic radii, one electron in the outer shell |
2 | Alkaline Earth | Metals | two electrons in the outer shell, low reactivity, easily form divalent cations |
3-12 | Transition Metals | Metals | Very hard, high melting and boiling points, high electrical conductivity, malleable |
17 | Halogens | Nonmetals | Highly reactive, 7 valence electrons, very different physical properties |
18 | Noble Gas | Nonmetals | Non-reactive, low boiling point, gas at room temperature |
Part 3: Periodic Table Worksheet:
Group #: | 17 |
Name of Group: | Halogens |
Period 1 | Period 2 | Period 3 | Period 4 | |
Element Info: Name Symbol Atomic Number Atomic Weight | Flourine F 9 18.9984032 | Chlorine Cl 17 35.453 | Bromine Br 35 79.904 | Iodine I 53 126.90447 |
Melting Point | -219.6 C | -101.5 C | -7.3 C | 113.7 C |
Boiling Point | -188.12 C | -34.04 C | 59 C | 184.3 C |
# Electrons in the outer shell | 7 | 7 | 7 | 7 |
Reactive or Stable? | Reactive | Reactive | Reactive | Reactive |
Fact #1 | Pale Yellow | Respiratory irritant | Only liquid nonmetallic element | Bluish-black lustrous solid |
Fact #2 | Corrosive Gas | Used as a war gas in 1915 | Reddish brown liquid which is very hazardous | Volatilises at room temperature into a blue-violet gas |
Conclusion:
New Element: Webtonium
Properties: very reactive, tends to gain 1 electron when making compounds
Which group does Webtonium belongs to?
Halogens
Provide 2 sentences supporting your answer.
Halogens are highly reactive. Halogens have 7 valence electrons, so when they react they gain 1 electron to make a complete valence set of 8 electrons.
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