Scientific Field Trip

Dalton's theory was not proven wrong.

Niels Bohr discovered that atoms contained electrons.

Which force is the most familar, and acts between all objects all of the time.

What are the names of the basic forces that are at work every where, even within the atom?

Isotopes are atoms that have the same number of protons and neutrons.

The mass of an atom is expressed how?

An electron cloud is a region around the nucleus of an atom where the electrons are likely to be found.

The number of protons in the nucleus of an atom is the what?

Which Greek philosopher disagreed with Democritus's ideas?

5 basic forces are at work everywhere even within an atom.

How many protons, neutrons, and electrons would you need to build a carbon atom?

The charges of protons and electrons are opposite but equal, so their charges cancel out.

John Dalton published his atomic theory in 1805.

How many atoms can a penny contain?

What is the mass number?

What is an atom made up of?

The nucleus is the small, porous, negatively charged center of the atom. It contains most of the atom's mass.

Protons are positively charged particles in the nucleus.

The weak force is an important force in radioactive atoms.

Erwin Schrodinger and Werner Heisenberg explained the nature of electrons in the atom.

J.J. Thomson proposed that electrons were located throughout an atom like plums in a pudding.

An atom is the smallest particle into which an element can be divided and still be the same substance

What are subatomic particles that have a negative charge called?

In physical science, an atom's central regions, which is made up of protons and neutrons is called what?

What are negatively charged particles found in electron clouds outside the nucleus called?

Who developed the atomic theory from observations gathered from many experiments?