Question

Which two groups of elements in the periodic table are the most reactive?(1 point)
Responses

alkali metals and halogens
alkali metals and halogens

noble gases and alkali metals
noble gases and alkali metals

alkaline earth metals and halogens
alkaline earth metals and halogens

halogens and noble gases
Answer
Use the periodic table to answer the question.

An illustration shows the periodic table.

Which statement about nitrogen (N) and phosphorus (P) is correct?

(1 point)
Responses

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 electron shells.
They have the same number of electron shells.
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Answer
Which property do transition metals have in common?(1 point)
Responses

They are usually very soft.
They are usually very soft.

They usually have high melting points.
They usually have high melting points.

They usually have low densities.
They usually have low densities.

They are usually very reactive.
Answer
Neon and argon are both in Group 18 of the periodic table. Which property do they most likely share?(1 point)
Responses

strong odor
strong odor

silver color
silver color

metallic texture
metallic texture

low or no reactivity
low or no reactivity
Answer
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

17 - halogens
17 - halogens

18 - noble gases
18 - noble gases

1 - alkali metals
1 - alkali metals

2 - alkaline earth metals
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