10 Questions
What is the core of an atom made of?
Protons and neutrons
What is the number of protons in an atom called?
Atomic number
What are extremely small subatomic particles that orbit the nucleus in an electron cloud?
Electrons
Atoms can gain or lose electrons, or share electrons with other atoms in order to form what?
Covalent bond
What subatomic particles are located in the nucleus with protons and have no charge?
Neutrons
What is the smallest unit of matter that still holds the properties of an element?
Atom
How many elements occur naturally?
92
What is the approximate size of an atom in meters?
$10^{-10}$ meters
Which subatomic particle has a positive charge?
Proton
What unit do scientists use to measure the mass of subatomic particles?
Atomic mass unit (amu)
Test your knowledge on the smallest unit of matter and its properties. Learn about elements, chemical and physical properties, and the composition of elements through atoms.
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