The atom!

Which of the following is NOT a property of electrons?

• Mass 1.840 times smaller than hydrogen atom
• Small size
• Negative charge
• Part of the nucleus

What is the role of neutrons in determining atomic mass?

• They give the number of protons
• They give the size of the atom
• They give the charge of the atom
• They give the mass of the atom

What is the mass of a neutron compared to a proton?

• Really large
• Slightly larger (but similar)
• Slightly smaller (but similar)
• Really small

What is the charge of a proton?

• Negative
• No charge
• Positive
• Neutral

What is the atomic mass of an element?

• The sum of protons, electrons and neutrons
• The average mass of the mass numbers of its isotopes
• The number of electrons
• The number of protons

What is the charge of an cation?

• Positive
• Negative
• Neutral
• No charge

What is the mass of an electron compared to a proton?

• Negligible
• Equal
• 1.840 times smaller
• 1.840 times larger

What causes electrical phenomena in matter?

• Gravity
• Friction
• Magnetism
• Electric charge

Why do electrons move around the nucleus of an atom?

• Due to gravity
• Due to magnetism
• Due to common sense (o "cultura general")
• Due to attraction

What is the charge of an electron?

• No charge
• Negative
• Positive
• Neutral