DIA 1 - Atomic Theory

What particle(s) are found in the nucleus of an atom?

• protons and electrons

• protons only

• electrons and neutrons

• protons and neutrons

Why are the metalloids specials elements?

• they are good conductors

• they are shiny

• they have properties of both metals and nonmetals

• they are bendable

The atomic theory changed many times over the years. What caused the atomic theory to change?

• new models were created

• some scientists did not believe in atoms

• new technology led to new observations and evidence

• the original observations were not accurate

If the number of protons equal the number of _____, the atom will have no charge because the charges would cancel each other out.

• protons

• neutrons

• electrons

• nucleus

The smallest particle of any particular type of matter is known by which of the following terms?

• Compound
• Atom
• Chemical
• Element

Subatomic particles with a POSITIVE charge are called ________.

• Protons

• Neutrons

• Electrons

• Nucleus

In Bohr's model of the atom, the rings around the atomic nucleus represent the electrons' _______________ level.

• charge

• home

• energy

• speed

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When will a theory be modified?

• when scientists no longer believe in the theory

• when a law is written to take the place of the theory

• when new technology leads to new observations and evidence

• when the theory is outdated

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On the periodic table, the elements are arranged by

• average atomic mass

• increasing atomic number

• the number of electrons they have

• decreasing atomic number

How can you tell one type of atom from another?

• by the number of protons

• by the number of neutrons

• by the number of electrons

• by the number of protons and neutrons combined