Atoms, Elements, and the Periodic Table

The atomic number tells you what?

• number of electrons
• number of protons
• number of neutrons
• both electrons and protons in an atom.

A neutron has a charge of

• +2
• No charge
• -1
• +1

A nucleus of an atom contains what two parts?

• Electrons and Protons

• Neutrons and Electrons

• Protons and Neutrons

How many protons are in Beryllium?

• 4
• 9
• 5
• 2

How many neutrons does Chlorine (Cl) with an atomic number of 17 and an atomic mass of 35.

• 17

• 18

• 19

The atomic mass of Titanium is 48 and its proton is 22, therefore its number of neutron is ________

• 22

• 48

• 26

• 70

A substance composed of two or more elements chemically bonded together.  Examples are H₂O and CO₂.

• Element
• Compound
• Electron Cloud
• Metalloid

What Greek philosopher suggested that the universe was made of invisible units called atoms

• Democritus

• Dalton

• Jefferson

What are the elements called in Groups 3-12 of the periodic table?

• Alkai Metals

• Transitional Metals

• Noble Gases

Isotopes of an element have different number of ___________ and therefore have different masses.

• Proton

• Neutron

• Electon