Electrons
What is an electron shell?
The place in which electrons orbit the nucleus
Where can you find protons and neutrons?
Nucleus
What do you use to find the number of electron shells?
Periods
What does it mean when an atom is reactive?
The atom is unstable and willing to interact with another atom
Which is false?
A. each square has a different element
B. Each element has a different number of protons
C. The AMU must always be a whole number
D. Periods represent the number of shells
C.
If an atom is neutral then what does that mean about the protons and electrons?
They are equal
How many electrons can each shell hold? (shells 1-3)
1: 2
2&3: 8
Nitrogen (N) is in group ______ or ______.
15 or 5A
What makes atoms unstable?
Not a full outer shell
What are the atomic number and atomic mass of Carbon (C)?
12.011 AMU an 6
What causes electrons to stay near their atom?
The attraction to the protons
What is an isotope?
An atom with a different number of neutrons than normal
If an atom is in group 8A and period 3, how many electrons does it have?
18
Which groups are most reactive?
1 and 7
Sodium (Na) has how many neutrons?
12
How many electrons does Chlorine (Cl) have with a charge of negative 1?
18
What is the purpose of the outer electrons?
Bonding
How do groups and periods help us organize the periodic table?
They tell us the number of shells and valence electrons
Why are groups 1 and 7A the most reactive to each other?
They can fill each others outer shells
Why are the AMU of elements a decimal?
Isotopes
How do atoms become molecules?
They bond together
How many neutrons does a Chlorine atom have if it's AMU is 37?
20
What does Lithium (Li) need to do to become stable?
To give up it's one valence electron
Why are Noble Gasses not reactive?
Their outer shell is full
How do we use a period square to build an atom?
They tell us the AMU which can be used to find neutrons, the atomic number is the amount of protons, and the groups can help us find the number of electrons in each shell.