★ Must-know
The four most common elements in living organisms are:
An atom has a central nucleus containing protons and neutrons, with electrons in the surrounding outer region.
Further detail
1. Which description best defines an atom?
2. Which arrangement describes the basic structure of an atom?
3. What does the atomic number of an element represent?
What defines matter?
Anything that occupies space and has mass.
Which four elements are most common in living organisms?
Carbon, oxygen, hydrogen, and nitrogen.
What does an element’s atomic number identify?
Its number of protons.
What does atomic mass approximately equal, in amu?
The number of protons plus neutrons.
In a neutral atom, how does the proton count relate to its electron count?
They are equal.
What does a chemical reaction change between atoms?
The distribution of electrons.
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