Atomic Models & Structure
Subatomic Particles
History of the Atom
Periodic Families
Periodic Trends
100

Dalton’s model described the atom as this type of structure.

What is a solid sphere?

100

The three main subatomic particles are ____, ____, and ____.

What are protons, neutrons, and electrons? 

100

The first person to use the term “atomos.”

Who is Democritus?

100

Elements in the same column of the periodic table are called ____.

What are groups or families?

100

As you move across a period, atomic radius generally ____.

What is decreases?

200

Bohr’s model introduced this new concept about electrons.

What are energy levels or shells?

200

This subatomic particle has a positive charge.

What is a proton?

200

This scientist discovered the electron using the cathode ray tube.

Who is J. J. Thomson?

200

This family includes highly reactive metals in Group 1.

What are the alkali metals?

200

As you move down a group, atomic radius generally ____.

What is increases?

300

The modern atomic model shows electrons moving in these regions instead of fixed paths.

What are orbitals or an electron cloud?

300

The atomic number tells you the number of ____.

What are protons?

300

This experiment led to the discovery of the nucleus.

What is Rutherford’s Gold Foil Experiment?

300

These nonmetals are found in Group 17 and are very reactive.

What are the halogens?

300

The tendency of an atom to attract electrons is called ____.

What is electronegativity?

400

This model best explains why electrons stay near the nucleus due to opposite charges.

What is the Bohr model?

400

An isotope has a different number of these particles.

What are neutrons?

400

This scientist proposed quantized energy levels for electrons.

Who is Bohr?

400

This group is stable and nonreactive.

What are the noble gases?

400

The energy required to remove an electron is called ____.

What is ionization energy?

500

Arrange the models from simplest to most modern: Dalton, Rutherford, Bohr, Quantum.

What is Dalton → Rutherford → Bohr → Quantum?

500

An ion forms when an atom gains or loses these particles.

What are electrons?

500

The modern model of the atom is based on this branch of science.

What is quantum mechanics?

500

Elements in the same family have similar chemical properties because they have the same number of these.

What are valence electrons?

500

Which element has the highest electronegativity on the periodic table?

What is fluorine?

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