Atomic Structure & Periodic Table Mania

Which of the following is an example of a heterogeneous mixture?

Atoms of the same element that have a different number of neutrons are called ____________.

Elements on the modern periodic table are arranged according to their _________.

Which subatomic particles are located inside the nucelus of an atom?

To become a negative ion, an atom must ____________.

The sum of the number of protons and neutrons inside the nucleus is called the __________.

Valence electrons are located _________.

Which of the following is an example of a homogeneous mixture?

Elements that have chemical and physical properities of both metals and nonmetals are _____.

How many neutrons does Rb-85 contain?

An atom, as shown on the periodic table, is neutral because it contains equal numbers of

A row on the periodic table is also called a ________.

A column on the periodic table can also be called a ________ or a ___________.

To become a positive ion, an atom must ___________ .

Which listing below shows the proper charges of the subatomic particles?

The number of protons an atomc contains is identified by the ____  ____ on the periodic table.

Carbon-13 and Carbon-14 are examples of _______________ for the carbon element.

Who organized the first periodic table based the elements' atomic masses?

The average mass of all the isotopes for a given atom is called ___________.