Semester Final 2024

Two or more elements chemically combined together are called a

• Element

• Compound

• Mixture

• Solution

The simplest natural substance is called a(n)

• Element

• Compound

• Mixture

• Solution

The first letter of a chemical symbol is always a

• Capital

• Lowercase

• Number

• Symbol

H2O is an example of

• Compound

• Element

Ne is an example of

• Compound

• Element

The atomic number tells you what?

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

Which group of the periodic table is composed of inert (not reactive)  gases?

• alkali metals
• alkaline earth metals
• halogens
• noble gases

The atoms along the staircase are called 

• metals
• nonmetals
• metalloids
• noble gases

Which is the correct formula for:
one carbon (C)
two oxygen (O)

• CO₂
• CO
• C₂O
• 2CO

How many elements are in H₂O?

• 1
• 2
• 3
• 4