Question

section review

1. use the periodic table on the inside back cover to write the names for the elements that have the following symbols: o, s, cu, ag.
2. use the periodic table to write the symbols for the following elements: iron, nitrogen, calcium, mercury.
3. which elements are most likely to undergo the same kinds of reactions, those in a group or those in a period?
4. describe the main differences between metals, nonmetals, and metalloids.

Explanation:

Step1: Identify elements from symbols

O is oxygen, S is sulfur, Cu is copper, Ag is silver.

Step2: Write symbols for given elements

Iron is Fe, nitrogen is N, calcium is Ca, mercury is Hg.

Step3: Answer question about reactions

Elements in a group have the same number of valence - electrons, so they are most likely to undergo the same kinds of reactions.

Step4: Describe differences

Metals are good conductors of heat and electricity, have a shiny luster, and are malleable and ductile. Non - metals are poor conductors, often dull in appearance, and brittle. Metalloids have properties intermediate between metals and non - metals, such as semi - conductivity.

Answer:

1. Oxygen, Sulfur, Copper, Silver
2. Fe, N, Ca, Hg
3. Elements in a group
4. Metals are good conductors, shiny, malleable and ductile. Non - metals are poor conductors, dull, brittle. Metalloids have intermediate properties like semi - conductivity.