Question

an the data table below regarding the periodic table of the elements.

1. the most electronegative element on the periodic table is
2. which group of metals is the most reactive group?

why? because group 1a elements can easily lose an electron. ( their electron config. ends in $s^1$)

1. which group of nonmetals is the most reactive group?

why? because group 7a elements can easily gain an electron. (their electron config. ends in $s^2p^5$)

1. which group of elements is non - reactive/least reactive

why?

1. fill in the chart below by placing a check mark by the properties that match each type of element.

physical/chemical property	metals	nonmetal
brittle (means object can )
malleable (means object can )
conductive (can carry a charge or heat)
dull (not shiny)
react with acid
typically gaseous at room temperature
typically solid at room temperature

1. unknown element x has luster and is malleable, this unknown is probably a (metal / non metal).
2. metals are located to the of the staircase (with the exception of hydrogen) and nonmetals to the of staircase. metalloids are located .

which of the following elements is a metalloid? a.ca b. o c. si d. ne

Explanation:

Step1: Analyze Question 5

The question asks for the most reactive group of metals. From periodic table knowledge, Group 1A (alkali metals) has 1 valence electron, which is easily lost, making them highly reactive.

Step2: Analyze Question 6

For the most reactive nonmetals, Group 7A (halogens) has 7 valence electrons, needing 1 more, so they easily gain electrons, making them reactive.

Step3: Analyze Question 7

The least reactive group is Group 8A (noble gases) as they have a full valence shell (8 electrons, except He with 2), so they don't easily gain or lose electrons.

Step4: Analyze Question 8

• Lustrous: Metals are lustrous (shiny), nonmetals not.
• Brittle: Nonmetals are brittle, metals not (malleable/ductile).
• Malleable: Metals can be hammered into sheets, nonmetals not.
• Conductive: Metals conduct, nonmetals (except graphite) don't.
• Dull: Nonmetals are dull, metals lustrous.
• React with Acid: Many metals react, nonmetals generally don't.
• Gaseous at RT: Nonmetals (e.g., O₂, N₂), metals solid (except Hg).
• Solid at RT: Most metals solid, some nonmetals (e.g., C) solid.

Step5: Analyze Question 9

Luster and malleability are metal properties, so X is a metal.

Step6: Analyze Question 10

Metals are left of the staircase, nonmetals right, metalloids along the staircase.

Step7: Analyze the last question

Metalloids: Si (silicon) is a metalloid. Ca is metal, O nonmetal, Ne noble gas.

Answer:

1. Group 1A (Alkali metals)
2. Group 7A (Halogens)
3. Group 8A (Noble gases); Because they have a full valence electron shell (8 electrons, or 2 for He), so they do not easily gain or lose electrons.

8.

Physical/Chemical Property	Metals	Nonmetal
Brittle (break easily)		✔
Malleable (hammer into sheets)	✔
Conductive	✔
Dull		✔
React with Acid	✔
Typically Gaseous at RT		✔
Typically Solid at RT	✔	✔ (e.g., C)

1. metal
2. left; right; along the staircase

Last question: c. Si