bio exam 1: electron shells & ions
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12 Terms
What is an electron shell?
An energy level around the nucleus where electrons are found
Which electron shell fills first?
The first shell, closest to the nucleus
How many electrons fit in the first shell?
2
How many electrons fit in the second shell?
8
How many electrons fit in the third shell in the simplified model?
8
What makes an atom chemically inert? (a substance does not easily react, combine, or change when it mixes with other chemicals or touches air, water, or heat)
Having a full outer electron shell
Which elements are chemically inert?
Noble gases
What is ionization energy?
Energy required to remove an electron from an atom
What is a cation?
A positively charged ion that lost electrons
What is an anion?
A negatively charged ion that gained electrons
How do you draw an electron shell diagram?
Draw the nucleus and fill electron shells from the inside outward
How many electrons does a neutral atom have?
The same number as protons