DCP #3 Review (21-22)

Which statement best where electrons are found?

• Electrons are found inside area Z and have no charge

• Electrons are found in area X and have no charge

• Electrons are found in area X and have a negative charge

• Electrons are found in area Z and have a negative charge

Which statement correctly compares the masses of subatomic particles in an atom such as carbon?

• An electron has a greater mass than a proton

• A proton has about the same mass as an electron

• A proton has about the same mass as an neutron

• Neutrons, protons, and electrons have the same mass

How many protons does an atom of Rubidium (Rb) have with 48 neutral particles?

• 48

• 37

• 1

• 5

Students build a model of a lithium atom with different colored marbles. Based on the chart, which marbles should the students place in the nucleus of their lithium atom model?

• Blue and green

• Blue and red

• Green and red

• Blue, green and red

Which two elements have the same chemical reactivity as Rubidium (Rb) with 48 neutral particles?

• Potassium and Strontium

• Calcium and Strontium

• Sodium and Potassium

• Strontium and Tin

Some students observe four different lab investigations. The students record their observations in a table. Which investigation most likely involved a chemical reaction?

• Investigation 1

• Investigation 2

• Investigation 3

• Investigation 4

What is the difference between the number of electrons in an atom of Barium (Ba) and the number of electrons in Phosphorus (P)?

• 3

• 41

• 56

• 15

Part of the periodic table is shown. In which numbered position would a Period 4 element that is a metal with three valence electrons be located?

• Position 13

• Position 15

• Position 20

• Position 31

A scientist performed an investigation involving a reaction that produced Al₂(SO₄)₃. How many sulfur atoms are represented in this formula?

• 1 atom

• 3 atoms

• 7 atoms

• 9 atoms

A student creates a chart listing some characteristics of four substances. Which substances is most likely a metal element?

• Substance 1

• Substance 2

• Substance 3

• Substance 4