END OF MODULE 3 TEST

Front

What is the charge of an atom with 3 protons, 4 neutrons, and 2 electrons?

Back

The atom has a +1 charge.

Front

Who proposed the first atomic theory?

Back

John Dalton proposed the first atomic theory.

Front

What subatomic particles are found in the nucleus of an atom?

Back

Protons and neutrons are found in the nucleus of an atom.

Front

In a decay equation, what do the missing numbers typically represent?

Back

The missing numbers represent the atomic mass and atomic number of the elements involved.

Front

What happens to an atom of helium if you add one more proton?

Back

It becomes a different kind of element.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the difference between protons and neutrons?

Back

Protons have a positive charge, while neutrons have no charge.

Front

What is an ion?

Back

An ion is an atom that has gained or lost one or more electrons, resulting in a charge.

Front

What is the significance of Dalton's atomic theory?

Back

Dalton's atomic theory laid the foundation for modern chemistry by introducing the concept that matter is made up of atoms.

Front

How does the addition of neutrons affect an atom?

Back

Adding neutrons changes the isotope of the element but does not change the element itself.