An atom is a single particle that cannot be divided into smaller parts.

An atom is structured with a central nucleus containing protons and neutrons, surrounded by electrons in orbitals.

An atom consists of a solid core made of electrons and a cloud of protons.

Atoms are made up entirely of neutrons with no other particles present.

John Dalton

Albert Einstein

Erwin Schrödinger

Niels Bohr

The Rutherford model describes electrons as particles in fixed positions.

The Bohr model suggests that atoms are indivisible and cannot be split.

The Bohr model includes quantized electron orbits, while the Rutherford model does not.

The Rutherford model includes electron clouds around the nucleus.

An ion is a type of atom that cannot gain or lose electrons.

An ion is a neutral particle formed by the combination of protons and neutrons.

An ion is a charged particle formed by the fusion of two atoms.

An ion is a charged particle formed by the loss or gain of electrons.

The mass number is the average weight of all isotopes of an element.

The mass number of an atom is the sum of its protons and neutrons.

The mass number is the number of electrons in an atom.

The mass number is the total number of chemical bonds in an atom.

CO2

H2O

H2O2

NaCl

Isotopes differ in the number of protons and chemical properties.

Isotopes have the same number of neutrons and different atomic numbers.

Isotopes are identical in mass but differ in charge.

Isotopes differ in the number of neutrons and atomic mass.

+1

0

-1

+2

Protons can be counted by measuring the mass of the atom.

The number of protons is determined by the number of electrons.

The number of protons in an atom is equal to its atomic number.

The number of protons is equal to the number of neutrons.

Rutherford

JJ thomson

Chadwick

Bohr

3

4

2

8