atomic structure review

Which part of the atom contains most of the mass?

• Electrons

• Nucleus

• Protons

• Neutrons

Tags

NGSS.HS-PS1-8

Isotopes have the same number of ____, but different number of ____.

• neutrons; protons

• protons; electrons

• protons & electrons; neutrons

• electrons; protons

Naturally occurring chlorine that is put in pools has an average atomic mass of 35.46 amu. The two isotopes that exist are chlorine-35 and chlorine-37. Which isotope is more abundant?

• Chlorine-35

• Chlorine-37

• Cannot be determined.

In a neutrally charged atom what two subatomic particles must be equal?

• Neutrons & Protons

• Electrons & Neutrons

• Protons & Electrons

• protons, electrons & neutrons

What does the number 84 in krypton-84 represent?

• the atomic number

• the mass number

• the sum of the protons and electrons

• twice the number of protons

Tags

NGSS.HS-PS1-8

How many neutrons are in carbon-14?

• 6

• 8

• 7

• 14

There are two naturally occuring isotopes of lithium, lithium-7 and lithium-6. If the average atomic mass is 6.941 which isotope is more abundant?

• Neither, same abundance

• Lithium-6

• Lithium-7

Carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils, has

• 6 neutrons.

• 8 neutrons.

• 10 neutrons.

• 14 neutrons.

Tags

NGSS.HS-PS1-8

Determine the atomic number, mass number, number of protons, neutrons, and electrons for a neutral atom of potassium-39.

• Atomic # 19

  Mass # 39

  Protons 19

  Neutrons 20

  Electrons 19

• Atomic # 19

  Mass # 39.098

  Protons 19

  Neutrons 19

  Electrons 19

• Atomic # 39

  Mass # 19

  Protons 39

  Neutrons 19

  Electrons 39

• Atomic # 19

  Mass # 39.098

  Protons 19

  Neutrons 20

  Electrons 19

Tags

NGSS.MS-PS1-1

What unit is used to measure weighted atomic mass?

• amu

• gram

• angstrom

• nanogram