atoms, elements, compounds

Which statements correctly describe a compound?

• It is a pure substance.

• It is an impure substance.

• It is made up of only one element.

• It is made up of two or more elements.

• The elements in a compound are chemically combined in a fixed ratio.

This is a list of the 118 known elements that exist (and a picture of it is on this quiz!).

• The Periodic Table of Elements

• The Student Faculty Handbook

• Facebook

• Wikipedia

Which example is a compound?

• N₂

• O₂

• Cu

• H₂O₂

What is the atomic number of this atom?

• 1

• 3

• 4

• 7

Can a mixture be separated? 

• No
• Yes
• Only sometimes

These hang out in the nucleus and don't really affect the properties of the atom that much. They don't have any charge (so they can't use credit cards).

• neutrons

• protons

• electrons

• atomic numbers

How many valence electrons does Oxygen (O) have?

• 6

• 8

• 15

• 16

Classify the picture with the correct label.

• Element
• Compound
• Mixture of Elements
• Mixture of Compounds

what happens in a covalent bond

• electrons in the energy shell

• atoms are shared

Which subatomic particle has a relative charge of +1?

• the proton
• the neutron
• the electron
• the photon