Understanding Atoms and Elements

What are the basic components of an atom?

• Protons, neutrons, and electrons

• Electrons, ions, and molecules

• Neutrons, ions, and electrons

• Protons, neutrons, and molecules

Which particle in an atom has a positive charge?

• Neutron

• Electron

• Proton

• Ion

How does the mass of an electron compare to that of a proton?

• Equal mass

• 2000 times smaller

• Twice as heavy

• 2000 times larger

What is the primary reason most of an atom is empty space?

• Atoms are made of molecules

• Electrons orbit far from the nucleus

• Atoms are very small

• Protons and neutrons are very dense

What happens when an atom gains an extra electron?

• It becomes a positive ion

• It remains unchanged

• It becomes a negative ion

• It becomes a neutral atom

What is the charge of an ion with more protons than electrons?

• Zero

• Negative

• Positive

• Neutral

What does the atomic number of an element represent?

• Number of ions

• Number of protons

• Number of electrons

• Number of neutrons

How do you calculate the number of neutrons in an atom?

• Atomic number minus mass number

• Number of electrons minus protons

• Mass number minus atomic number

• Number of protons plus electrons

Which element is represented by the symbol 'O'?

• Oganesson

• Osmium

• Oxygen

• Osmium

What information does the mass number of an element provide?

• Total number of protons

• Total number of protons and neutrons

• Total number of ions

• Total number of electrons