Matter and Periodic Table

For any given element which of the following never changes?

• The ratio of neutrons to electrons in an atom.

• The number of protons in an atom.

• The charge on the atom.

• The atomic mass of an atom.

What does the atomic number of an atom represent?

• The number of energy levels in an atom of that element

• The number of protons in an atom of that element

• The quantity of protons and neutrons in the nucleus of an atom of that element

• The overall mass of a normal atom of that element

Which statement about the relative masses of subatomic particles is true?

• Protons, neutrons, and electrons all have about the same mass

• Neutrons have virtually no mass at all.

• Electrons have a lot more mass than either a proton or neutron.

• Electrons have a lot less mass than protons or neutrons.

Where is most of the mass in an atom found? 

• Electron shells

• Orbitals

• Nucleus

• Outermost edge

The modern periodic table is organized according to ______.

• atomic number and similar properties

• atomic mass and similar nucleus configuration

• atomic radius and size of isotopes

• atomic mass and atomic number 

What do elements in the same family/group have in common?

• The size of electrons shells/energy levels

• The number of positively charged protons

• The size of the nucleus

• The number of valence electrons

What do elements in the same period have in common?

• The same size atomic radius

• The quantity of electrons

• The number of electron shells/energy levels

• The number of neutrons in the nucleus

An atom has an atomic number of 18 and an atomic mass of 40. How many neutrons are in its nucleus?

• 58

• 40

• 22

• 18

An atom of a certain element has 4 energy levels and 2 electrons in its outer energy level.  How many protons would this element have?

• 38

• 32

• 20

• 6

Which element is a halogen gas with 3 energy levels?

• Argon

• Neon

• Flourine

• Chlorine