Which two groups of elements in the periodic table are the most reactive?(1 point)
Responsesalkali metals and halogens
alkali metals and halogens
halogens and noble gases
halogens and noble gases
noble gases and alkali metals
noble gases and alkali metals
alkaline earth metals and halogens
alkali metals and halogens
Which statement about nitrogen (N) and phosphorus (P) is correct?
(1 point)
Responses
They have the same number of electron shells.
They have the same number of electron shells.
They are both classified as halogens.
They are both classified as halogens.
They have the same number of valence electrons.
They have the same number of valence electrons.
They are both inert.
They are both inert.
They have the same number of valence electrons.
Which property do transition metals have in common?(1 point)
Responses
They usually have high melting points.
They usually have high melting points.
They are usually very soft.
They are usually very soft.
They usually have low densities.
They usually have low densities.
They are usually very reactive.
They usually have high melting points.
Neon and argon are both in Group 18 of the periodic table. Which property do they most likely share?(1 point)
Responses
low or no reactivity
low or no reactivity
metallic texture
metallic texture
strong odor
strong odor
silver color
low or no reactivity
A scientist studies an element that has seven electrons in its outer shell, is fairly toxic, is a gas at room temperature, and is highly reactive. To which group of the periodic table does this element belong?(1 point)
Responses
1 - alkali metals
1 - alkali metals
17 - halogens
17 - halogens
2 - alkaline earth metals
2 - alkaline earth metals
18 - noble gases
17 - halogens
Why are the noble gases the least reactive elements? (1 point)
Responses
They have an empty inner electron shell.
They have an empty inner electron shell.
They are the elements with the smallest atomic mass.
They are the elements with the smallest atomic mass.
They are the most electronegative elements.
They are the most electronegative elements.
They have a full valence electron shell.