What is the smallest unit of an element that retains its properties?
Which of the following is an element?
A compound is formed when:
Which of the following is a compound?
What is the chemical symbol for hydrogen?
Which particle is found in the nucleus of an atom?
Electrons are found:
Which of these is made up of only one type of atom?
Water (H₂O) is a:
The symbol "Na" stands for:
Which of the following is NOT an element?
Atoms combine to form:
Which element is represented by the symbol O?
How many different elements are present in carbon dioxide (CO₂)?
Which of the following is an example of a molecule made of the same element?
Which of these is the chemical formula for common salt?
Which particle has a negative charge?
Which particle has no electrical charge?
Which of these is an element found in pencils?
What is the chemical symbol for silver?
