Question

what is a period?

• list 3 elements that are in the same period:
• what do members of a period have in common?

consider the following row in the periodic table of elements:
li be b c n o f ne

• which elements are the most likely to conduct electricity?
• which elements are gases at room temperature?
• which elements are most likely to be malleable and ductile?

Explanation:

A period is a horizontal row in periodic table. Elements in same period have same number of electron - shell levels. Metals conduct electricity, gases at room - temp and malleable/ductile are also based on element properties.
Li, Be, B are in same period. Li is metal for conductivity, Ne is gas, Li and Be are metals for malleability/ductility.

Answer:

What is a period?: A horizontal row in the periodic table
List 3 elements that are in the same period: Li, Be, B
What do members of a period have in common?: Same number of electron - shell levels
Which elements are the most likely to conduct electricity?: Li
Which elements are gases at room temperature?: Ne
Which elements are most likely to be malleable and ductile?: Li, Be