Cobalt has a mass number of 59 and an atomic number of 27. A student wants to create a model of a cobalt atom. Which statement about the model is correct?(1 point)

Question

Responses

The model should show 27 protons and 27 neutrons.
The model should show 27 protons and 27 neutrons.

The model should show 59 protons and 27 neutrons.
The model should show 59 protons and 27 neutrons.

The model should show 32 protons and 59 neutrons.
The model should show 32 protons and 59 neutrons.

The model should show 27 protons and 32 neutrons.

Answer 1

The model should show 27 protons and 32 neutrons.

Answer 2

In a molecule of lithium sulfide, there are two atoms of lithium and one atom of sulfur. Which statement about lithium sulfide is correct?(1 point)
Responses

Both lithium and sulfur form positive ions.
Both lithium and sulfur form positive ions.

A molecular model of lithium sulfide would have two spheres.
A molecular model of lithium sulfide would have two spheres.

The chemical formula for lithium sulfide is LiS2.
The chemical formula for lithium sulfide is LiS 2 .

The atoms in lithium sulfide are held together by bonds.
The atoms in lithium sulfide are held together by bonds.

Answer 3

The correct statement about lithium sulfide is:

The atoms in lithium sulfide are held together by bonds.

Answer 4

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)

selenium (Se)
selenium (Se)

krypton (Kr)
krypton (Kr)
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Answer 5

The element that has the same number of valence electrons as bromine (Br) is chlorine (Cl).