Chemistry Quiz

Which model of the atom improved upon the Thomson (plum pudding) model?

• Bohr model

• Rutherford (nuclear) model

• All of the above

• Current quantum mechanical model

What subatomic particle identifies an element?

• All of the above

• Electron

• Neutron

• Proton

What is the atomic number of the element shown to the left?

• 39

• 23

• 19

• 11

Tags

NGSS.HS-PS1-1

How many protons and electrons are in a neutral atom of the element shown to the left?

• 11 protons, 11 electrons

• 11 protons, 19 electrons

• 19 protons, 11 electrons

• 19 protons, 19 electrons

Tags

NGSS.HS-PS1-1

How is the name of the most common isotope of an element determined when using the periodic table?

• By looking at the number of protons plus the number of electrons

• By looking at the number of neutrons

• By looking at the mass number and rounding to the nearest whole number

• By looking at the atomic number

How many neutrons does the most common isotope of potassium have?

• 19

• 18

• 20

• 21

How many protons does uranium-235 have?

• 238

• 235

• 143

• 92

Do all isotopes of uranium have the same number of neutrons?

• No

• Yes

Do all isotopes of uranium have the same number of protons?

• No

• Yes

Do all ions of uranium have the same number of protons?

• No

• Yes

Tags

NGSS.HS-PS1-7