Which scientist proposed that each element is made up of tiny particles called atoms?

• JJ Thompson

• John Dalton

• Robert Millikan

• Ernest Rutherford

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What is the name of the atomic model proposed by John Dalton?

• Plum Pudding Model

• Nuclear Model

• Billiard Ball Model

• Planetary Model

What did JJ Thompson discover using the cathode ray tube experiment?

• Nucleus

• Electrons

• Neutrons

• Protons

What charge do electrons carry?

• Positive

• Negative

• Neutral

• Variable

What was the main finding of Millikan's oil drop experiment?

• The existence of the nucleus

• The mass of the electron

• The structure of the atom

• The charge of the electron

What did Rutherford's gold foil experiment demonstrate about the atom?

• Electrons orbit the nucleus in fixed paths

• Atoms are indivisible

• Atoms have a dense, positively charged nucleus

• Atoms are mostly solid

What does the atomic number of an element represent?

• Number of neutrons

• Number of protons

• Number of electrons

• Atomic mass

How are elements arranged in the periodic table?

• By alphabetical order

• By increasing atomic number

• By increasing atomic mass

• By chemical reactivity

What remains constant in isotopes of the same element?

• Atomic mass

• Number of electrons

• Number of protons

• Number of neutrons

What is the term for the sum of protons and neutrons in an atom?

• Isotope number

• Electron number

• Mass number

• Atomic number

Tags

NGSS.MS-PS1-5