Question

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

alkaline earth metals and halogens
alkaline earth metals and halogens

halogens and noble gases
halogens and noble gases

noble gases and alkali metals
noble gases and alkali metals

alkali metals and halogens

Answer 1

The two groups of elements in the periodic table that are the most reactive are **alkali metals and halogens**.

Answer 2

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

(1 point)
Responses

They are both inert.
They are both inert.

They are both classified as halogens.
They are both classified as halogens.

They have the same number of electron shells.
They have the same number of electron shells.

They have the same number of valence electrons.

Answer 3

The correct statement about nitrogen (N) and phosphorus (P) is:

**They have the same number of valence electrons.**

Both nitrogen and phosphorus are in Group 15 of the periodic table, so they each have five valence electrons.

Answer 4

Which property do transition metals have in common?(1 point)
Responses

They are usually very reactive.
They are usually very reactive.

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

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

They usually have high melting points.

Answer 5

The property that transition metals have in common is:

**They usually have high melting points.**

Transition metals are known for their high melting points compared to many other elements.

Answer 6

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

silver color
silver color

strong odor
strong odor

low or no reactivity
low or no reactivity

metallic texture

Answer 7

Neon and argon are both in Group 18 of the periodic table, and they most likely share the property of:

**low or no reactivity.**

Both neon and argon are noble gases, known for their lack of reactivity due to having complete valence electron shells.

Answer 8

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

18 - noble gases
18 - noble gases

17 - halogens
17 - halogens

2 - alkaline earth metals
2 - alkaline earth metals

1 - alkali metals

Answer 9

The element described, which has seven electrons in its outer shell, is fairly toxic, is a gas at room temperature, and is highly reactive, belongs to:

**17 - halogens.**

The halogens are known for having seven valence electrons, being reactive, and including gaseous elements such as fluorine and chlorine.