Chemistry atomic models

What is an atom?

• A unit which is very electrical

• Smallest unit into which matter can be divided without the release of electrically charged particles

• Smallest unit into which matter can't be divided without the release of electrically charged particles

• The biggest unit into which matter can be divided

What is a molecule?

• All matter is made up of ions, and it is the way in which the atoms are rejected to each other

• The union of intermolecular atoms

• All matter is made up of atoms, and it is the way in which the atoms are attached to each other

• The rejection of cations

Dalton proposed that all the atoms of an element were equal to each other (they all had the same mass) and this was different from the mass of the atoms of the other chemical elements

• True

• False

Electrons have ________ charge

Protons have _______ charge

What is atomic number?

• The number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of electrons in the nucleus.

• The number of protons in the nucleus of an atom.

• The most important characteristic of an atom is the number of negative charges in its nucleus

All atoms that have the same number of protons (atomic number), but that vary in the number of neutrons, are isotopes of a chemical element.

• True

• False

Mass number is the substraction of particles in the nucleus (protons and neutrons)

• True

• False

The question : What makes up everything? is supported by Heracycle and

Empedocles in the..............

• COMPOSITION OF MATTER

• DIVISIBILITY OF MATTER

The author of atomism..............

• Empedocles

• Democritus

• Aristoteles

• Leucippus