How many neutrons are in a neutral atom of Silver-108 (Ag)?

• 108 neutrons

• 47 neutrons

• 155 neutrons

• 61 neutrons

Tags

NGSS.MS-PS1-1

What is the charge of the nucleus of an oxygen atom?

• 0

• -2

• +8

• +16

The atomic masses and the natural abundances of the two naturally occurring isotopes of lithium are shown in the table below. Which numerical setup can be used to determine the atomic mass of lithium?

• (0.075)(6.02 amu) + (0.925)(7.02 amu)

• (0.925)(6.02 amu) + (0.075)(7.02 amu)

• (7.5)(6.02 amu) + (92.5)(7.02 amu)

• (92.5)(6.02 amu) + (7.5)(7.02 amu)

Tags

NGSS.HS-PS1-7

What is the total number of subatomic particles (protons, neutrons, and electrons) in an atom of potassium-39?

• 19

• 20

• 39

• 58

Tags

NGSS.MS-PS1-1

Which phrase describes an atom?

• a negatively charged nucleus surrounded by positively charged protons

• a negatively charged nucleus surrounded by positively charged electrons

• a positively charged nucleus surrounded by negatively charged protons

• a positively charged nucleus surrounded by negatively charged electrons

What does the atomic number represent?

• The number of electrons present in the atom

• The number of neutrons present in the atom

• The number of protons present in the atom

• The number of protons and neutrons in the atom

Tags

NGSS.MS-PS1-1

Which particles have approximately the same mass?

• an electron and an alpha particle

• an electron and a proton

• a neutron and an alpha particle

• a neutron and a proton

What is the number of electrons in an atom that has 3 protons and 4 neutrons?

• 1

• 7

• 3

• 4

Tags

NGSS.MS-PS1-1

As a result of the gold foil experiment, it was concluded that an atom

• contains protons, neutrons, and electrons

• contains a small, dense nucleus

• has positrons and orbitals

• is a hard, indivisible sphere

Tags

NGSS.HS-PS1-8

The gold foil experiment led to the conclusion that each atom in the foil was composed mostly of empty space because most alpha particle directed at the foil

• passed through the foil

• remained trapped in the foil

• were deflected by the nuclei in gold atoms

• were deflected by the electrons in gold atoms