Columns on the periodic table are referred to as:
Groups
If an atom has an atomic mass of 65 and atomic number 40, how many neutrons does it have?
25
Which group on the periodic table is non-reactive and why?
Group 18 has a full outer shell of valence electrons
What subatomic particle(s) make up the mass of an atom and are found in the nucleus of the atom?
neutrons and protons
Draw a Bohr model for Silicon (Si)

When drawing a Bohr diagram for Radium, how many energy shells are needed?
7
How many valence electrons does Aluminum have?
3
What subatomic particle identifies the element?
Proton
What do elements in the same column (group) have in common?
The number of valence electrons
Which of the following is not a pure substance?
CO2
O2
H
salt water
salt water
______ - _________ = number of neutrons
mass number - atomic number (or number of protons)
_______ + ________ = atomic mass
Protons, neutrons
What do elements in the same period have in common?
Same # of energy shells
Which 2 types of matter are considered pure substances?
Compound
Mixture
Element
Element
Compound
Name two groups on the periodic table that are likely to bond with each other
Group 1 and Group 17
Group 2 and Group 16
Group 13 and Group 15
What are the charges of the 3 subatomic particles?
Proton +
Neutron 0 (neutral)
Electron -
What's the maximum number of electrons the 1st 3 energy shells can hold?
2
8
8
Which 2 groups on the periodic table are the most reactive?
1 & 17
In a neutral atom, which 2 subatomic particles are equal in amount?
protons and electrons
Which 2 subatomic particles have the same mass and what is their mass?
Protons and Neutrons
1 amu