Summer School Physical Science - CH 18 - Section I

The central core of an atom is called the ________.

• hub

• nucleus

• grand junction

• plum bob

The region around the nucleus occupied by the electrons is called the negative zone.

• True

• False

The symbol for chlorine is ___________.

• C

• Ch

• Cl

• Au

According to present atomic theory, the location of an electron in an atom is best represented by a probability cloud.

• True

• False

Particles of matter that make up protons and neutrons are __________.

• electrons

• atoms

• isotopes

• quarks

A chemical symbol represents the __________ an element.

• name

• spirit

• structure

• type

A particle that moves around the nucleus is a(n) __________.

• proton

• neutron

• ion

• electron

This model this model was the first to show a nucleus, consisting of protons and neutron.  Electrons surround the nucleus but are not shown in distinct energy levels. 

• The "Rutherford Model" of the atom
• The "Plum Pudding Model" of the atom
• The "Quantum Mechanical Modell" of the atom
• Democritus's model of the atom

This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.

• Democritus's model of the atom
• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• The "Quantum Mechanical Model" of the atom

This is the most complete and current model of the atom. It consists of 61 elementary particles. Electrons are located in complex orbitals.

• The "Quantum Mechanical Model" of the atom
• The "Rutherford Model" of the atom
• The "Plum Pudding Model" of the atom
• The "Bohr Model" of the atom