Atoms and the Elements

What is the electrical charge of a proton?

• ionic
• positive
• negative
• neutral

Where are the protons and neutrons located in a helium atom?

• electron cloud
• ion
• outer energy level
• nucleus

Potassium has an atomic number of 19 and a mass number of 39. How many neutrons are in the nucleus of a typical potassium atom?

• 19
• 20
• 39
• 58

Which of the following is made of only one kind of atom and cannot be broken down into simpler substances?

• a molecule
• a compound
• an element
• a mixture

How are electrons different from both protons and neutrons?

• electrons are larger than protons and neutrons
• electrons are not found in the nucleus
• electrons have no electrical charger
• electrons are a different color than protons and neutrons

Most wires for electricity are made out of this metal?

• iron
• copper
• aluminum
• mercury

Which of the following correctly describes an important characteristic of an element?

• elements are made of different kinds of atoms bonded together
• elements are a mixture of different kinds of molecules
• elements are made of only one kind of atom
• elements are solid, organic substances

How are protons and neutrons different?

• protons are in the nucleus, while neutrons orbit the nucleus
• neutrons are in the nucleus, while protons orbit the nucleus
• protons have a positive charge, while neutrons have a negative charge
• protons have a positive charge, while neutrons have no charge

What is the atomic mass of an atom with 5 protons, 5 neutrons, and 5 electrons?

• 15
• 10
• 5
• 25

Where can electrons be found in an atom?

• electrons are located inside the nucleus of an atom
• electrons orbit the nucleus of an atom
• electrons are distributed evenly inside and around the nucleus of an atom
• electrons only exist when they are flowing between atoms