Atomic Model Test

• Electrons are not present in the nucleus of a silicon atom.

• There are 14 protons in the nucleus of a silicon atom.

• Silicon atoms have no electrons.

• A silicon atom should have 16 protons.

• There are equal numbers of protons and neutrons in a silicon atoms with a mass number of 28.

A student has been learning about atoms. He wrote a small paragraph describing one.

How and Atom Looks

An atom looks similar to a racetrack. There are small particles that move like cars on a racetrack. These particles move in a circle around the edge of the track and do not easily move away from the center.

The student describes particles on the edge of the atom. Which statement supports the student's claim that the particles on the edge of the atom do not move away from the center?

• The particles are connected to the center by an object similar to a rope.

• The particles are attracted to the center because they have a charge opposite to the center's charge.

• The particles are held in place because atoms are a solid structure.

• The particles are pushed toward the center by nuclear charges of other atoms.

Which of the following statements best describes an atom?

• a positively charged electron cloud surrounding a positively charged nucleus.

• a positively charged electron cloud surrounding a negatively charged nucleus

• a negatively charged electron cloud surrounding a positively charged nucleus

• a negatively charged electron cloud surrounding a negatively charge nucleus

What is the atomic mass of Carbon (C)?

• 39.95

• 12.01

• 6

• 17

An atom's mass number equals the number of

• protons plus the number of electrons

• protons plus the number of neutrons

• protons

• neutrons

Which of the following is an accurate illustration of a nitrogen atom?

• A

• B

• C

• None of the above

Select the 2 subatomic particles below that are located inside the nucleus of an atom

• electrons

• protons

• cloud

• orbitals

• neutrons

An iron atom has an atomic mass of 58. It's atomic number is 26. How many neutrons does the iron atoms have?

• 32

• 58

• 26

• 82

Which statement best describes electrons?

• They are positive subatomic particles and are found in the nucleus

• They are positive subatomic particles and are found surrounding the nucleus

• They are negative subatomic particles and are found in the nucleus

• They are negative subatomic particles and are found surrounding the nucleus

He discovered the neutron in the nucleus and completed the current atomic model.

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• James Chadwick