Atoms Elements And Ions In Our Universe

Dr. Mark explains the concepts of atoms, elements, and ions. He begins by defining atoms, their Greek origin, and their role in the universe. The structure of atoms, including protons, neutrons, and electrons, is discussed, along with their charges. Elements are defined by their proton count, and ions are introduced as charged atoms. The formation of ions is explained through comparisons with noble gases, highlighting the roles of sodium, magnesium, and chloride ions in the body.

What does the Greek word 'atom' mean?

• Cuttable

• Divisible

• Visible

• Indivisible

Which element makes up the largest percentage of the human body by mass?

• Nitrogen

• Carbon

• Hydrogen

• Oxygen

What charge does a neutron have?

• Positive

• Negative

• Variable

• No charge

How many protons does a carbon atom have?

• Ten

• Eight

• Six

• Four

What defines an element?

• Number of electrons

• Number of neutrons

• Number of protons

• Number of atoms

What is an ion?

• A neutral atom

• A charged atom

• A trace element

• A noble gas

Which noble gas is closest to sodium in the periodic table?

• Neon

• Helium

• Krypton

• Argon

What happens to sodium when it loses an electron?

• It becomes negatively charged

• It becomes neutral

• It remains unchanged

• It becomes positively charged

How does chloride become an ion?

• By gaining a proton

• By losing an electron

• By losing a proton

• By gaining an electron

What role do ions play in the body?

• They only balance minerals in bones

• They are only involved in digestion

• They maintain homeostasis and send nerve signals

• They have no significant role