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What is the smallest piece of matter?
Element
Atom
Compound
Molecule
Which of the following is an example of an element?
Oxygen (O)
Carbon Dioxide (CO₂)
Water (H₂O)
Air
What type of bond forms compounds?
Magnetic attraction
Mixing of elements
Sharing or transferring electrons
Physical bonding
Which model describes atoms as tiny indestructible spheres?
Solid Sphere Model
Plum Pudding Model
Periodic Table Model
Nuclear Model
In the periodic table, rows are called:
Groups
Levels
Periods
Series
Which of the following is a mixture?
Water (H₂O)
Carbon Dioxide (CO₂)
Salt (NaCl)
Air
What does 'di-' mean in a compound's name, like carbon dioxide?
Three
One
Two
Four
What are the particles located in the nucleus of an atom?
Protons and electrons
Protons and neutrons
Neutrons and electrons
Electrons
What is the atomic number of an element?
The number of electrons
The number of neutrons
The number of atoms
The number of protons
How can mixtures be separated?
Using physical means
By bonding atoms
Chemically
Through oxidation
Compounds have the same properties as the elements that make them.
False
Atoms are the smallest unit of a compound.
False
An electron has a positive charge.
False
Air is a compound made of gases.
False
In compounds, metals usually come first in the name.
True
The columns in the periodic table are called __________.
Groups
