Atomic structure

The smallest unit of ordinary matter that forms a chemical element.

• Molecule

• Atom

• Proton

• Electron

Electrons, protons and neutrons

• Three basic particles of an atom

• Three basic particles of a molecule

• Three strange words

• Three electronic devices

More than 99.94% of an atom's mass is in

• the protons

• the neutrons

• the electrons

• the nucleus

Fixed distances from the nucleus of an atom where electrons may be found

• Shells

• Valence electrons

• Orbits

• None of the above

When electrons go from upper energy level to lower energy level, they ...

• Emit energy

• Absorb energy

• Do nothing

• None of these

The charge of a neutron is

• 1.6*10^-19 C

• -1.6*10^-19 C

• 0

The charge of an electron is

• 1.6*10^-19 C

• -1.6*10^-19 C

• 0

The number of protons found in the nucleus of every atom

• Z - Proton number

• N - Atomic number

• A - Atomic number

• N - Proton number

The total number of protons and neutrons

• A - Atomic number

• A - Nucleon number

• A - Mass number

• A - Neutron number

The same number of protons but different numbers of neutrons in each atom

• Electrons

• Protons

• Nucleai

• Isotopes