1.2 - Modeling Atoms

Which subatomic particles are positively charged?

• Electrons

• Neutrons

• Protons

• Nucleus

What is the charge of an electron?

• +1

• 0

• -1

• +2

What is the approximate mass of a proton?

• 0.0005 amu

• 1 amu

• 2 amu

• 0 amu

What surrounds the nucleus of an atom?

• Proton cloud

• Neutron cloud

• Electron cloud

• Atom cloud

What is the atomic number of an element?

• The number of electrons in an atom

• The number of protons in an atom

• The number of neutrons in an atom

• The total number of protons and neutrons in an atom

For an atom to be neutral, what must be true about the number of protons and electrons?

• Protons must be greater than electrons

• Electrons must be greater than protons

• Protons must equal electrons

• Neutrons must equal electrons

What is the atomic number of helium?

• 1

• 2

• 3

• 4

How many protons does silver have?

• 47

• 48

• 49

• 50

What is the atomic number of iodine?

• 51

• 52

• 53

• 54

What is the atomic number of an element?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The number of electrons in the outer shell

• The atomic mass of the element