Atomic Structure and Periodic Table

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

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

The first letter of a chemical symbol is written as a ______ letter.

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

What is the correct ordering of these small parts of matter, from the smallest to the largest?

Valence electrons are located _________.

_______ is responsible for the atomic theory.

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

What is the term used for the electrons in the outermost shell or energy level?

Neutrons and protons are found in the ..... of the atom.

How many neutrons does Rb-85 contain?

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

Because atoms have the same number of protons and electrons, atoms are ____.

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

Which subatomic particles have approximately the same size and mass as each other?

A single proton has what type of charge?

If an atom has 16 protons it will also always have _______.

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

The chemical symbol for Neon is __?

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

How many electrons are in the element Polonium (Po)?

The subatomic particle that moves around the nucleus is.....

How many protons are in the element Polonium (Po)?

The atomic number of an element is the same as the number of ____ an element.