Definitions
What does the atomic number tell us about an atom?
The Number of Protons
Which subatomic particle has a negative charge?
Electrons
Which atom has an atomic number of 35?
Bromine
In an atom the number of protons and electrons are always ____.
Equal
If this changes, the element changes into a different element
Number of Protons
Which atom has 20 electrons?
Calcium
What is the mass number?
Protons plus Neutrons
Which subatomic particles are in the nucleus?
Protons and Neutrons
Are periods the rows or columns of the periodic table?
Rows
What do elements in the same group on the periodic table have in common?
Chemical properties
How many electrons can the first, second, and third ring of the atom hold?
2,8,18
Which element has an atomic mass of 58.93?
Cobalt
What does the atomic mass tell us about an element?
The average mass of all atoms of that element
Which subatomic particles have mass?
Protons and Neutrons
Which element is in the 16th group and the 3rd period?
Sulfur