Question

1. five unknown elements that are sealed in separate glass containers and then observed. below is information obtained about each element.

element	appearance	additional information
2	silvery solid	fairly hard, found in upset stomach remedies, burns with a bright light in air
3	silvery solid	rather hard, compounds found in bones and hard water
4	colorless gas	inert gas, used to fill balloons
5	greenish gas	poisonous, found in bleach

a. list the elements that are metals ______________
b. list the elements that belong to the halogens_______, noble gases________
c. what elements would you expect to find in the same group?______________
d. predict the name of elements 1___, 2_, 3_, 4_, and 5___

chart about atomic radius, electron affinity, ionization energy, metallic character, nonmetallic character trends

fill in the blanks below

1. the most reactive metals are located (bottom/top) (left/right) on the periodic table.
2. the most reactive nonmetals are located (bottom/top) (left/right) on the periodic table.

Explanation:

For Question 20:

a. Metals are typically shiny solids (at standard conditions) with metallic properties. Elements 1,2,3 are silvery solids matching metal traits.
b. Halogens are reactive nonmetals; element 5 is a poisonous greenish gas in bleach (a halogen trait). Noble gases are inert; element 4 is an inert gas for balloons.
c. Elements 1,2,3 are all alkali/alkaline earth metals, so they share group properties.
d. Match traits to known elements:

1. Lightweight, strong, silvery solid for foil = Aluminum
2. Used in antacids, burns bright = Magnesium
3. In bones/hard water = Calcium
4. Inert gas for balloons = Helium
5. Poisonous greenish gas in bleach = Chlorine

For Questions 21-22:

1. Periodic table trend: Most reactive metals are at bottom-left (low ionization energy, high metallic character).
2. Most reactive nonmetals are at top-right (high electron affinity/ionization energy, high nonmetallic character).

Answer:

20.
a. Elements 1, 2, 3
b. halogens: Element 5; noble gases: Element 4
c. Elements 1, 2, 3
d. 1: Aluminum; 2: Magnesium; 3: Calcium; 4: Helium; 5: Chlorine

1. BOTTOM, LEFT
2. TOP, RIGHT