Matter Interactions Unit Test
3 of 153 of 15 Items
Question
Use the periodic table to answer the question.
An illustration shows the periodic table.
Which element has the same number of valence electrons as bromine (Br)?
(1 point)
Responses
chlorine (Cl)
chlorine (Cl)
potassium (K)
potassium (K)
krypton (Kr)
krypton (Kr)
selenium (Se)
3 answers
selenium (Se)
Why are sodium (Na) and potassium (K) in the same group on the periodic table?(1 point)
Responses
They are both colorless.
They are both colorless.
They are both hard and brittle.
They are both hard and brittle.
They have similar reactivity.
They have similar reactivity.
They have similar atomic weights.
Responses
They are both colorless.
They are both colorless.
They are both hard and brittle.
They are both hard and brittle.
They have similar reactivity.
They have similar reactivity.
They have similar atomic weights.
The correct answer is: They have similar reactivity.
Sodium (Na) and potassium (K) belong to Group 1 on the periodic table, also known as the alkali metals. Elements in this group have similar chemical properties and reactivity due to their single valence electron. Sodium and potassium both have one valence electron, making them highly reactive and prone to forming ions with a charge of +1. This similarity in reactivity is why they are placed in the same group on the periodic table.
Sodium (Na) and potassium (K) belong to Group 1 on the periodic table, also known as the alkali metals. Elements in this group have similar chemical properties and reactivity due to their single valence electron. Sodium and potassium both have one valence electron, making them highly reactive and prone to forming ions with a charge of +1. This similarity in reactivity is why they are placed in the same group on the periodic table.
1 answer