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16 Terms
Which two particles are found in the nucleus?
Protons and neutrons
What kind of charge do protons have?
Positive
What kind of charge do neutrons have?
Neutral
What kind of charge do electrons have?
Negative
Which number is the mass number?
12
Which number is the atomic number?
20
What is a mass number?
Total number of protons and neutrons
What is an atomic number?
Number of protons / number of electrons
How many electrons can the 1st shell hold?
2
How many electrons can the other shells hold?
8
What is electronic structure?
Number of electrons in each shell
What does the number of shells say about an elements position in the periodic table?
Period
What does the number of electrons in the outer shell say about an elements position in the periodic table?
Group
What happens to reactivity as you go down Group 1?
Increases
What happens to reactivity as you go down Group 7?
Decreases