Chemistry Ch 3 Atoms

The average atomic mass of an element is the average of the atomic masses of its

The atomic number of oxygen, 8, indicates there are eight _____

The atomic mass of an element listed in the periodic table is the

Ancient Greek philosopher who first proposed the notion of the atom

The atomic symbol for beryllium indicates that the atomic number is

Which of the following statements is true according to modern atomic theory?

Isotopes are atoms of the same element that have different

Molar mass of an element

Experiments with cathode rays led to its discovery

Millikan's experiments led to the determination

Molar mass is numerically equal to ____

O₂ combines with C to form 2 compounds, CO and CO₂. The ratio of the masses is 1:2. Which law?

As the mass number of an element's isotope increases, the number of protons

Which is not part of Dalton's atomic theory?

All atoms of the same element have the same

Phosphorus-33 (atomic number 15) contains

Atoms of the same element can differ in

Nuclear particle with about the same mass as a proton, but with no electrical charge

Neutral atoms contain equal numbers of

Carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils, has

The number of atoms in 1 mol of carbon is

Who created the "plum pudding" model?

The atomic theory proposed by Dalton has been

Dalton's atomic theory helped explain the law of conservation of mass because it stated atoms

In oxides of nitrogen, such as N₂O, NO, and NO₂, atoms combine in small whole-number ratios

Compared with a mole of lead atoms, a mole of iron atoms contains

The number of atoms in a mole of a pure substance

Most of the volume of an atom is occupied by the

Which concept in Dalton's atomic theory has been modified?

Smallest particle of an element that retains the properties of that element

An atom of potassium has 19 protons and 20 neutrons. What is its mass number?

Chlorine has atomic number 17 and mass number 35. It has

Confirmed the existence of the neutron

According to the law of definite proportions, any two samples of KCl have the same

When Na, H₂, and O₂ react, the mass of the compound is ___the sum of the masses of the elements

Dalton's atomic theory agrees with modern theory except for which statement?

The total number of protons and neutrons in the nucleus of an atom

Rutherford's gold-foil experiment led him to conclude that

All isotopes of hydrogen contain