Chapter 3 science

Niels Bohr believed that electrons move through spherical regions located a fixed distance from the nucleus

John dalton first suggested that elements are made of atoms and that the atoms of an element are all alike

The Bohr model suggests that electrons move

The unique number of protons in the atoms of an element is the elements

The ___ is about 1836x the mass of an electron. The slightly more massive ____ is about 1838x the mass of an electron

Quantum mechanics is a branch of physics that deals with ____

Copper-63 and copper-65 can never have the same

Atoms of the same element with differing numbers of neutrons are called

Carbon-14 is different from carbon-12 because it has a different number of

Hantaro nagaoka developed the Saturnian model

JJ Thomson discovered electrons using crookes tubes

The smallest of the main subatomic particles is the

What is J.J. Thomason’s atomic model called?

Ernest Rutherford developed the nuclear model

The idea that opposite electrical charges attract and like electrical charges repel

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

According to research with crookes tubes which of the following scientists suggested cathode rays were made negative

A positively/negatively charged atom is known as

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?

J.J. Thomson discovered the existence of the..

The earliest record of a particle theory of matter is from the…

Ions that have a negative charge are called cations

Democritus suggested that matter

The law of electrostatic charges states that

An anion has more _____ than ____

The gold foil experiments led to the discovery of the

Which of the following is a weighted average

An ion that has more protons than electrons is called cation

Democritus thought of indivisible “atomos”

JJ Thomson developed the plum pudding model

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