Marie and Pierre Curie

ability of radium to give off rays (person)

E=mc² (person)

photon

"up," "down," "strange," "charm," "top," or "bottom"

a. atoms are made of protons and electrons

which of th following statements was NOT part of Dalton's hypothesis on the structure of matter?

a. atoms are made of protons and electrons

b. atoms unite in definite ratios to form compounds

c. all matter is made of atoms

d. atoms of the same element are identical

according to Avogrado's hypothesis, under the same conditions equal volumes of gases have the same _____.

a. density

b. molecular mass

c. number of particles

d. mass

b. electrons move around the nucleus as planets orbit the sun.

which of the following ideas is NOT retained in the current theory of atomic structure?

a. most of the volume of an atom is empty space

b. electrons move around the nucleus as planets orbit the sun

c. electrons can absorb or emit energy only in whole numbers of photons

d. atoms have a central positively-charged nucleus

combining Thompson's work on the charge-to-mass ratio of an electron with Millikan's work on the charge of an electron made it possible to determine the _____.

a. speed of an electron

b. pathway of an electron

c. mass of an electron

d. diameter of an electron

the electron charge and mass number of a neutron are, respectively,

a. 0 and 1

b. 1+ and 1

c. 1+ and 0

d. 1- and 1

two isotopes of an element have different _____.

a. numbers of electrons

b. numbers of protons

c. atomic numbers

d. mass numbers

Rutherford's gold foil experiment demonstrated that _____.

a. electrons have a negative charge

b. energy is given off in little packets

c. X rays are charateristic of the metal used in the anode

d. most of the atom is empty

which of the following ideas about matter did Aristotle have?

a. specific substances always contain elements in the same ratio by mass

b. matter is continuous

c. there is a different type of atom for each type of material

d. matter is made of atoms

in comparing two compounds of nitrogen and oxygen, it found that for every 14 grams of nitrogen in a compound A there were 16 grams of oxygen. In compound B, for every 14 grams of nitrogen there were 32 grams of oxygen. The ratio of oxygen masses combining with a constant nitrogen mass in these compounds id therfore 2 to 1. which of the following is illustrated by this observation?

a. law of conservation of matter

b. Dalton's hypothesis

c. law of multiple proportions

d. law of definite proportions

which of the following subatomic particles is considered to be a truly elementary particle?

a. meson

b. baryon

c. hadron

d. lepton

which of the followinf forms of radiation is composed of quanta?

a. gamma

b. alpha

c. positron

d. beta

according to the Rutherford-Bohr model of the atom, what prevents the electrons from being pulled into the nucleus?

a. the large distance between an electron and nucleus

b. the existence of a nuclear force

c. the electrons are in orbit aorund the nucleus

d. the very small size of an electron

the set of wavelengths absorbed or emitted by a substance is its _____.

a. ground state

b. mass number

c. spectrum

d. quantum number

d. 1.19 x 10¹⁵ Hz

what is the frequency of ultraviolet light that has a wavelength of 153 nm?

a. 7.59 x 10¹⁴ Hz

b. 2.56 x 10¹⁵ Hz

c. 8.43 x 10¹⁴ Hz

d. 1.19 x 10¹⁵ Hz

b. carbon- 12

atomic mass is a relative scale based on which of the following nuclides?

a. nitrogen-14

b. carbon- 12

c. oxygen- 16

d. hydrogen- 1