Flashcards: Atomic Structure and Bohr Model — 10 cards

What did Dalton’s atomic theory regard the atom as?

The indivisible ultimate particle of matter.

What did Thomson observe about cathode rays in his 1897 experiment?

They traveled from cathode to anode in straight lines without fields and caused fluorescence on zinc sulfide.

Which laws did Dalton’s atomic theory explain successfully?

The laws of conservation of mass, constant composition, and multiple proportions.

Which author determined the electron charge-to-mass ratio in 1897?

J.J. Thomson.

What does the atomic number $Z$ represent in an atom?

The number of protons in the nucleus.

How is the weighted average atomic mass calculated?

By summing each isotope's mass multiplied by its fractional abundance.

What fields compose an electromagnetic wave and how are they oriented?

Oscillating electric and magnetic fields perpendicular to each other and propagation direction.

What formula relates electromagnetic wave speed to wavelength and frequency?

$c=\lambda\nu$

How is the atomic mass unit (u) defined?

One-twelfth the mass of a carbon-12 atom.

What average atomic mass results from silver isotopes 106.90509 u and 108.90470 u?

107.867 u