8th Grade Science STAAR - Cat. 1 Review

What is the charge of a proton?

• Neutral/No Charge

• Negative

• Positive

• Variable

Where is the neutron located in an atom?

• Electron Cloud

• Nucleus

• Outside the atom

• In the proton

Most of the mass of an atom is found in the __________, and most of the volume of an atom is empty space in the __________.

• Nucleus, Electron Cloud

• Electron Cloud, Nucleus

• Proton, Neutron

• Neutron, Proton

What is the total number of protons, neutrons, and electrons in an atom that has a mass of 186?

• Proton - 75, Electron - 75, Neutron - 111

• Proton - 93, Electron - 93, Neutron - 93

• Proton - 75, Electron - 75, Neutron - 111

• Proton - 111, Electron - 111, Neutron - 75

What is the difference in the number of electrons between one atom of Potassium (K) and Radon (Rn)?

• 67

• 86

• 19

• 75

How many valence electrons does magnesium have?

• 1

• 2

• 7

• 8

How many valence electrons does fluorine have?

• 1

• 2

• 7

• 8

How many valence electrons does hydrogen have?

• 1

• 2

• 7

• 8

What is used to determine an atom's identity?

• Number of neutrons

• Number of valence electrons

• Protons and atomic number

• Electron configuration

Reactivity of an atom is determined by what?

• Number of protons

• Atomic mass

• Number of valence electrons

• Number of neutrons