Atoms & APE MAN

1. Protons are found in which part of an atom, and what are their electrical charge and mass?

• Nucleus; positive charge; mass of 1 amu

• Electron cloud; negative charge; negligible mass

• Nucleus; negative charge; mass of 0 amu

• Electron cloud; positive charge; mass of 1 amu

Where are neutrons found in an atom and what electrical charge and mass do they have?

• Neutrons are found in the nucleus, have no electrical charge, and have a mass similar to protons.

• Neutrons are found in the electron cloud, have a positive charge, and have no mass.

• Neutrons are found in the nucleus, have a negative charge, and have a mass much less than protons.

• Neutrons are found in the electron cloud, have no charge, and have a mass similar to electrons.

3. Where are electrons found in an atom, and what electrical charge and mass do they have?

• Electrons are found in the nucleus, have a positive charge, and a large mass.

• Electrons are found in the electron cloud, have a negative charge, and negligible mass.

• Electrons are found in the nucleus, have no charge, and a large mass.

• Electrons are found in the electron cloud, have a positive charge, and negligible mass.

The “atomic number” of an atom identifies:

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The total number of electrons and protons

• The atomic mass of the atom

The “atomic mass” of an atom is:

• The total number of protons and neutrons in the atom

• The number of electrons in the atom

• The number of protons in the atom

• The number of neutrons in the atom

The atomic number of a particular element can ever change. Is this statement true or false?

• True

• False

Can the atomic mass of an atom of a particular element ever change? Why or why not?

• Yes, because the number of neutrons can vary.

• No, because the atomic mass is always constant.

• Yes, because the number of protons can change.

• No, because atoms cannot change mass.

What are electrons on the outermost energy level (also called orbital or shell) of electrons called?

• Core electrons

• Valence electrons

• Protons

• Neutrons

How many protons would atoms of the element Boron (B) have?

• 5

• 6

• 7

• 4

How many valence electrons would atoms of the element Boron (B) have?

• 3

• 1

• 5

• 7