Chem 4.1, 4.2, 4.3 CK12

Atoms of one element may be the same as atoms of a different element.

The cathode ray was composed of particles.

Elements can combine to form

Complete atoms are electrically

The law of definite proportions means that

Cathode rays were shown to be streams of __________ particles.

John Dalton was a chemist and a

An atom can be classified as a particular element based on

The number of neutrons will not always equal the number of electrons in the atom.

The cathode rays were deflected towards a negatively charged metal plate.

The nucleus of the atom is composed of

_________ discovered the proton in 1886.

The number of neutrons in an atom equals

One of the following is not true about Democritus

Rutherford’s experiment used _________ to bombard the foil.

The idea of the atom did not develop until the Renaissance.

Rutherford performed the _________ foil experiment to study atomic structure.

Electrons contribute a large amount to the atomic mass of an element.

The number of positively charged protons must equal the number of negatively charged electrons.

The mass number for an element is the

All atoms of the same element must have the same atomic number.

The value for the charge on the electron depends on the gas used in the cathode ray tube.

Atoms of different elements can combine in fractional ratios to form compounds.

By the 1700s chemists had accepted the idea of

Carbon and oxygen can combine to form

A scanning tunneling microscope is needed to see atoms.

How is the cosmos organized?

John Dalton proposed that all matter was composed of

The atomic number for an element indicates the number of

Some elements can combine to form more than one compound.

Chemical reactions can change atoms of one element into atoms of a different element.

Dalton’s atomic theory was based on all of the following except

Atoms combine is small whole-number ratios to form compounds.

The neutron has approximately the same mass as the proton.

Chemical reactions do not involve the of atoms.

J.J. Thomson carried out experiments with

Millikan’s oil drop experiment determined the mass of the

The proton was first called a canal ray.