Which two groups of elements in the periodic table are the most reactive?(1 point)
Responses
noble gases and alkali metals
noble gases and alkali metals
alkali metals and halogens
alkali metals and halogens
alkaline earth metals and halogens
alkaline earth metals and halogens
halogens and noble gases
9 answers
alkali metals and halogens
Which statement about nitrogen (N) and phosphorus (P) is correct?
(1 point)
Responses
They are both inert.
They are both inert.
They have the same number of valence electrons.
They have the same number of valence electrons.
They have the same number of electron shells.
They have the same number of electron shells.
They are both classified as halogens.
(1 point)
Responses
They are both inert.
They are both inert.
They have the same number of valence electrons.
They have the same number of valence electrons.
They have the same number of electron shells.
They have the same number of electron shells.
They are both classified as halogens.
They have the same number of valence electrons.
Which property do transition metals have in common?(1 point)
Responses
They are usually very soft.
They are usually very soft.
They are usually very reactive.
They are usually very reactive.
They usually have high melting points.
They usually have high melting points.
They usually have low densities.
Responses
They are usually very soft.
They are usually very soft.
They are usually very reactive.
They are usually very reactive.
They usually have high melting points.
They usually have high melting points.
They usually have low densities.
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
strong odor
strong odor
low or no reactivity
low or no reactivity
silver color
silver color
metallic texture
Responses
strong odor
strong odor
low or no reactivity
low or no reactivity
silver color
silver color
metallic texture
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
2 - alkaline earth metals
2 - alkaline earth metals
18 - noble gases
18 - noble gases
17 - halogens
Responses
1 - alkali metals
1 - alkali metals
2 - alkaline earth metals
2 - alkaline earth metals
18 - noble gases
18 - noble gases
17 - halogens
17 - halogens
12 answers