Question 1

What is an element?

Accepted Answer

A substance that cannot be broken down any further (by chemical means)

Question 2

What are the four most common elements in living organisms?

Accepted Answer

Oxygen, carbon, hydrogen, nitrogen

Question 3

What are trace elements?

Accepted Answer

An element only required in small amounts

(in humans: iron, iodine, copper)

Question 4

What are isotopes?

Accepted Answer

Variants of a chemical element that differ in neutron number

(same charge; every element has at least one isotope)

Question 5

What is radiometric dating?

Accepted Answer

Method for determining the age of materials from the decay of radioactive elements

Question 6

What are chemical compounds?

Accepted Answer

A combination of elements in a fixed ratio

Elements, AP Biology Flashcards