Democritus suggested that matter

The law of electrostatic charges states that

J. J. Thomson discovered the existence of the

Experiments involving ___ led to the discovery of the nucleus.

Which of the following is not a reason that the Bohr model is still in widespread use today?

Potassium-39 and potassium-41 always have the same number of

Which of the following is not a way that an ion can be formed?

Which of the following represents a sodium atom that has lost an electron?

Which of the following is not typically represented with whole numbers?

The development of the modern periodic table came as a result of

The modern periodic table arranges elements according to

Elements in the same ___ on the periodic table have the same number of valence electrons.

Where are nonmetals found on the periodic table?

How many valence electrons do the alkaline-earth metals have?

Uranium, found below the main body of the periodic table, is best classified as a(n)

What is the family name for the group containing chlorine?

Which diagram shows the correct electron dot notation for calcium?

Which of the following has the largest atomic radius?

Which of the following correctly arranges the elements from greatest electronegativity to the least?

John Dalton thought that atoms are indivisible and cannot be destroyed.

Most of an atom consists of empty space.

Quantum mechanics deals with the behavior of matter and energy at the atomic and subatomic levels.

Current atomic models show that electrons travel in distinct, spherical orbits around the nucleus.

The quantum-mechanical model is the primary model used by scientists today.

An anion has a negative charge because it has lost an electron.

Believed that electrons move through spherical regions located a fixed distance from the nucleus

First suggested that elements are made of atoms and that the atoms of an element are all alike

Thought of indivisible "atomos"

Developed the nuclear model

Developed the plum pudding model

Developed the Saturnian model

This subatomic particle is found in the nucleus and has no electrical charge.

This subatomic particle has a charge of +1e.

This subatomic particle is the most massive of these three subatomic particles.

The quantity of this subatomic particle in an atom of a substance determines the atom's identity.

This subatomic particle is the smallest of these three subatomic particles.

Ancient Greeks thought that all matter in the universe was made of only five elements.

The symbols that represent each element must always use two letters.

A family is the same as a period on the periodic table.

Alkaline-earth metals are slightly more reactive than alkali metals.

Most transition elements have one or two valence electrons.

Electron dot notation uses dots to represent all the non-valence electrons.

Elements with more protons and electrons almost always have larger atomic radii than those with fewer protons and electrons.

Demonstrated that combustion requires the presence of oxygen

Developed the law of octaves through arranging elements by atomic mass

First recognized groups of three elements with similar properties

Led to reorganizing the period table on the basis of atomic number

Organized elements with similar characteristics in columns like the modern periodic table

Used letters used to represent each element and superscripts to represent number of atoms

Brittle solids with metallic luster

Ductile, malleable, and lustrous

Possess four to eight valence electrons

Highly conductive and reactive

Semiconductors

Include almost 80% of the elements