a pure substance that cannot be broken down into

simpler substances by a chemical reaction is:

the organized array of all the chemical elements in order of increasing atomic number is the:

A 1-or 2- letter symbol that identifies the element is the:

The 3 subatomic particles found in an atom are:

The 2 subatomic particles found in the nucleus are:

The subatomic particles that identifies an element is the:

The subatomic particle that has a negative charge is the:

The subatomic particle that has a positive charge is the:

The center of the atom is called the:

The atomic number corresponds to the number of:

Palladium's atomic symbol is:

Iron's atomic symbol is:

Sodium's atomic symbol is:

What is the atomic number for Ni?

What is the atomic number for Be?

How many protons are in S (sulfur)?

How many protons are in Br (bromine)?

Subtracting the Mass # from the Atomic # gives the: